Provided by: remind_04.02.05-1_amd64 
NAME
remind - a sophisticated reminder service
SYNOPSIS
remind [options] filename [date] [*rep] [time]
DESCRIPTION
Remind reads the supplied filename and executes the commands found in it. The commands
are used to issue reminders and alarms. Each reminder or alarm can consist of a message
sent to standard output, or a program to be executed.
If filename is specified as a single dash '-', then Remind takes its input from standard
input. This also implicitly enables the -o option, described below.
If filename happens to be a directory rather than a plain file, then Remind reads all of
the files in that directory that match the pattern "*.rem". The files are read in sorted
order; the sort order may depend on your locale, but should match the sort order used by
the shell to expand "*.rem".
Remind reads its files starting from the beginning to the end, or until it encounters a
line whose sole content is "__EOF__" (without the quotes.) Anything after the __EOF__
marker is completely ignored.
OPTIONS
Remind has a slew of options. If you're new to the program, ignore them for now and skip
to the section "REMINDER FILES".
-n The -n option causes Remind to print the next occurrence of each reminder in a
simple calendar format. You can sort this by date by piping the output through
sort(1). Note that the -n option causes any -g option to be ignored.
-j[n] Runs Remind in "purge" mode to get rid of expired reminders. See the section PURGE
MODE for details.
-r The -r option disables RUN directives and the shell() function.
-c[flags]n
The -c option causes Remind to produce a calendar that is sent to standard output.
If you supply a number n, then a calendar will be generated for n months, starting
with the current month. By default, a calendar for only the current month is
produced.
You can precede n (if any) with a set of flags. The flags are as follows:
'+' causes a calendar for n weeks to be produced.
'a' causes Remind to display reminders on the calendar on the day they actually
occur as well as on any preceding days specified by the reminder's delta.
'l' causes Remind to use VT100 line-drawing characters to draw the calendar.
The characters are hard-coded and will only work on terminals that emulate
the VT00 line-drawing character set.
'u' is similar to 'l', but causes Remind to use UNICODE line-drawing characters
to draw the calendar. The characters are hard-coded and will only work on
terminals that are set to UTF-8 character encoding. This flag also enables
the use of the UNICODE "left-to-right" mark that can fix up formatting
problems with right-to-left languages in the calendar display.
'c' causes Remind to use VT100 escape sequences to approximate SPECIAL COLOR
reminders. Note that this flag is kept for backwards-compatibility; you
should use the -@[n][,m][,b] command-line option instead.
-@[n][,m][,b]
Tells Remind to approximate SPECIAL COLOR and SHADE reminders using VT100 escape
sequences. The approximation is (of necessity) very coarse, because the VT100 only
has eight different color sequences, each with one of two brightnesses. A color
component greater than 64 is considered "on", and if any of the three color
components is greater than 128, the color is considered "bright".
If you supply the optional numeric parameters, the have the following meanings:
n=0 tells Remind to use the standard 16 VT100 colors. n=1 tells it to use an
extended 256-color palette supported by many terminal emulators such as xterm. And
n=2 tells it to use escape sequences that support true 24-bit colors, again
supported by many terminal emulators such as xterm.
If the optional m parameter is supplied following a comma, then m=0 tells Remind
that the terminal background is dark, and Remind will brighten up dark colors to
make them visible. If m=1, then Remind assumes the terminal background is light
and it will darken bright colors to make them visible. If no m is supplied, or it
is supplied as m=2, then Remind does not perform any adjustments, and some
reminders may be hard or impossible to see if the color is too close to the
terminal background color.
If the optional b parameter is supplied following a comma, then b=0 tells Remind to
ignore SPECIAL SHADE reminders (the default) and b=1 tells Remind to respect
SPECIAL SHADE reminders by emitting VT100 escape codes to color the background of
the calendar cell. Note that SHADE does not work well unless you are using the
extended 256-color palette (n=1) or the true 24-bit colors (n=2). Note that for
calendar cells that are shaded, the clamping mechanism described earlier for m=0 or
m=1 is skipped; it is assumed that if you set both the foreground color of a
reminder and the background color of a cell, then you know what you are doing.
-wcol[,pad[,spc]]]
The -w option specifies the output width, padding and spacing of the formatted
calendar output. Col specifies the number of columns in the output device. If col
is not specified, or is specified as 0, it defaults to the larger of 71 or the
actual width of your terminal, or to 80 if standard output is not a terminal. If
col is specified as the letter t, then Remind attempts to get the width of the
/dev/tty terminal device. This is useful, for example, if you pipe calendar output
into less; even though standard output is a pipe, you want the calendar to be sized
correctly for your terminal window:
remind -c -wt .reminders | less
Note that the value of col is also used to set the system variable $FormWidth,
which is initialized to col - 8. See "SYSTEM VARIABLES" for details.
Pad specifies how many lines to use to "pad" empty calendar boxes. This defaults
to 5. If you have many reminders on certain days that make your calendar too large
to fit on a page, you can try reducing pad to make the empty boxes smaller. Spc
specifies how many blank lines to leave between the day number and the first
reminder entry. It defaults to 1.
Any of col, pad or spc can be omitted, providing you provide the correct number of
commas. Don't use any spaces in the option.
-s[a]n The -s option is very similar to the -c option, except that the output calendar is
not formatted. It is listed in a "simple format" that can be used as input for
more sophisticated calendar-drawing programs. If n starts with "+", then it is
interpreted as a number of weeks.
If you immediately follow the s with the letter a, then Remind displays reminders
on the calendar on the day they actually occur as well as on any preceding days
specified by the reminder's delta.
-p[a][p][p][q]n
The -p option is very similar to the -s option, except that the output contains
additional information for use by the Rem2PS program, which creates a PostScript
calendar, and various other back-end programs. For this option, n cannot start
with "+"; it must specify a number of months. The format of the -p output is
described in the rem2ps(1) man page. If you immediately follow the p with the
letter a, then Remind displays reminders on the calendar on the day they actually
occur as well as on any preceding days specified by the reminder's delta. If you
follow the p with another p, then Remind uses a more comprehensive JSON-based
format rather than the "simple calendar" format. This format is also documented in
the rem2ps(1) man page. Finally, if you use three p's, as in -ppp, then Remind
uses a pure JSON format, again documented in rem2ps(1). If you include a q letter
with this option, then the normal calendar-mode substitution filter is disabled and
the %"...%" sequences are preserved in the output.
Note that the -pp or -ppp options also enable the -l option.
-l If you use the -l option in conjunction with the -p option, then Remind outputs
additional information for back-end programs such as rem2ps. This additional
information lets the back-end programs correlate a reminder with the source file
and line number that produced it.
-m The -m option causes the -c or -p options to produce a calendar whose first column
is Monday rather than Sunday. (This conforms to the international standard.)
-v The -v option makes the output of Remind slightly more verbose. Currently, this
causes Remind to echo a bad line in case of an error, and to print a security
message if a script tests the $RunOff system variable.
-o The -o option causes Remind to ignore all ONCE directives.
-t The -t option causes Remind to trigger all non-expired reminders, regardless of the
delta supplied for each reminder.
-tn If you supply a number n after the -t option, then Remind pretends that each non-
expired reminder has a delta of n days and triggers reminders accordingly.
-tt[n] The -tt option causes Remind to assume a default delta of n minutes for all timed
reminders. If -tt is given with no n, a default delta of 5 minutes is used.
-h The -h option ("hush...") suppresses certain warning and information messages. In
particular, if no reminders are triggered, this mode produces no output.
-a The -a option causes Remind not to immediately trigger timed reminders that trigger
on the current day. It also causes Remind not to place timed reminders in a
calendar. If you supply two or more -a options, then Remind will trigger timed
reminders that are in the future, but will not trigger timed reminders whose time
has passed. (Regardless of how many -a options you supply, Remind will not include
timed reminders in the calendar if at least one -a option is used.)
-q The -q option causes Remind not to queue timed reminders for later execution.
-f The -f option causes Remind to remain in the foreground when processing queued
reminders, rather than forking off a background process to handle them.
-e The -e option diverts error messages (normally sent to the standard error stream)
to the standard output stream.
-dchars
The -d option enables certain debugging modes. The chars specify which modes to
enable:
e Echo all input lines
x Trace all expression evaluation
t Display all trigger date computation
v Dump the variable table after execution of the reminder script
l Echo lines when displaying error messages
f Trace the reading of reminder files
-g[a|d[a|d[a|d[a|d]]]]
Normally, reminders are issued in the order in which they are encountered in the
reminder script. The -g option cause Remind to sort reminders by date and time
prior to issuing them. The optional a and d characters specify the sort order
(ascending or descending) for the date, time and priority fields. See the section
"SORTING REMINDERS" for more information.
Note that -g is ignored if you use the -n option.
-b[n] Set the time format for the calendar and simple-calendar outputs. N can range from
0 to 2, with the default 0. A value of 0 causes times to be inserted in 12-hour
(am/pm) format. 1 causes times to be inserted in 24-hour format, and 2 inhibits
the automatic insertion of times in the calendar output.
-x[n] Sets the iteration limit for the SATISFY clause of a REM command. Defaults to
1000.
-kcmd Instead of simply printing MSG-type reminders, this causes them to be passed to the
specific cmd. You must use '%s' where you want the body to appear, and may need to
enclose this option in quotes. Note that all shell characters in the body of the
reminder are escaped with a backslash, and the entire body of the reminder is
passed as a single argument. Note that this option overrides the -r option and the
RUN OFF command.
As an example, suppose you have an X Window program called xmessage that pops up a
window and displays its invocation arguments. You could use:
remind '-kxmessage %s &' ...
to have all of your MSG-type reminders processed using xmessage.
A word of warning: It is very easy to spawn dozens of xmessage processes with the
above technique. So be very careful. Because all shell and whitespace characters
are escaped, the program you execute with the -k option must be prepared to handle
the entire message as a single argument.
If you follow the -k option with a colon, then the command is applied only to
queued timed reminders. Normal reminders are handled as usual. In the above
example, if you want normal reminders to simply be displayed as usual, but queued
reminders to be sent to notify-send, you could use:
remind '-k:notify-send %s &' ...
You use both -kcmd1 and -k:cmd2 to use different commands for queued versus non-
queued reminders.
-z[n] Runs Remind in the daemon mode. If n
is supplied, it specifies how often (in minutes) Remind should wake up to check if
the reminder script has been changed. N defaults to 1, and can range from 1 to 60.
Note that the use of the -z option also enables the -f option.
If you supply the option -z0, Remind runs in a special mode called server mode.
This is documented in the tkremind man page; see tkremind(1).
-uname Runs Remind with the uid and gid of the user specified by name. The option changes
the uid and gid as described, and sets the environment variables HOME, SHELL and
USER to the home directory, shell, and user name, respectively, of the specified
user. LOGNAME is also set to the specified user name. This option is meant for
use in shell scripts that mail reminders to all users. Note that as of Remind
3.00.17, using -u implies -r -- the RUN directive and shell() functions are
disabled. However, if you prefix name with a +-sign, then RUN and shell() are not
disabled. That is, -uwhatever switches the user to whatever and disables RUN,
whereas -u+whatever switches the user to whatever but leaves RUN enabled.
Non-root users can also use the -u option. However, in this case, it only changes
the environment variables as described above. It does not change the effective uid
or gid.
-+username
Causes Remind to trust files owned by the user username. Normally, if Remind reads
a file that you do not own, it disables RUN and the shell() function. This option
causes it to also trust files owned by username. You can supply multiple -+
options to trust multiple users, up to a limit of 20 trusted users.
-y Causes Remind to synthesize a tag for any reminder that lacks a TAG clause.
-ivar=expr
Sets the value of the specified var to expr, and preserves var. Expr can be any
valid Remind expression. See the section "INITIALIZING VARIABLES ON THE COMMAND
LINE" for more details.
-ifunc(args)=definition
Allows you to define a function on the command line.
If you supply a date on the command line, it must consist of day month year, where day is
the day of the month, month is at least the first three letters of the English name of the
month, and year is a year (all 4 digits) from 1990 to about 2075. You can leave out the
day, which then defaults to 1.
If you do supply a date on the command line, then Remind uses it, rather than the actual
system date, as its notion of "today." This lets you create calendars for future months,
or test to see how your reminders will be triggered in the future. Similarly, you can
supply a time to set Remind's notion of "now" to a particular time. Supplying a time on
the command line also implicitly enables the -q option and disables the -z option. The
time may be specified in 24-hour format (eg, 13:20) or common "AM/PM" format (1:20pm).
If you would rather specify the date more succinctly, you can supply it as YYYY-MM-DD or
YYYY/MM/DD. You can even supply a date and time on the command line as one argument:
YYYY-MM-DD@HH:MM.
In addition, you can supply a repeat parameter, which has the form *rep. This causes
Remind to be run rep times, with the date incrementing on each iteration. You may have to
enclose the parameter in quotes to avoid shell expansion. See the subsection "Repeated
Execution" in the section "CALENDAR MODE" for more information.
REMINDER FILES
Remind uses scripts to control its operation. You can use any text editor capable of
creating plain-text files to create a Remind script. The commands inside a script can
range from the very simple and almost immediately understandable:
REM 6 Jan MSG Dianne's birthday
to the baroque and obscure:
REM [date(thisyear, 1, 1) + 180] ++5 OMIT \
sat sun BEFORE MSG [ord(thisyear-1980)] payment due %b!
A reminder file consists of commands, with one command per line. Several lines can be
continued using the backslash character, as in the above example. In this case, all of
the concatenated lines are treated as a single line by Remind. Note that if an error
occurs, Remind reports the line number of the last line of a continued line.
Remind ignores blank lines, and lines beginning with the '#' or ';' characters. You can
use the semicolon as a comment character if you wish to pass a Remind script through the C
pre-processor, which interprets the '#' character as the start of a pre-processing
directive.
Note that Remind processes line continuations before anything else. For example:
# This is a comment \
This line is part of the comment because of line continuation \
and so on.
REM MSG This line is not ignored (no \ above)
Remind is not case sensitive; you can generally use any mixture of upper- or lower-case
for commands, parameters, invocation options, etc.
THE REM COMMAND
The most powerful command in a Remind script is the REM command. This command is
responsible for issuing reminders. Its syntax is:
REM [ONCE] [date_spec] [back] [delta] [repeat] [PRIORITY prio] [SKIP | BEFORE |
AFTER] [OMIT omit_list] [ADDOMIT] [NOQUEUE] [OMITFUNC omit_function] [AT time
[tdelta] [trepeat]] [SCHED sched_function] [WARN warn_function] [UNTIL expiry_date
| THROUGH last_date] [SCANFROM scan_date | FROM start_date] [DURATION duration]
[TAG tag] <MSG | MSF | RUN | CAL | SATISFY | SPECIAL special | PS | PSFILE> body
The parts of the REM command can be specified in any order, except that the body must come
immediately after the MSG, RUN, CAL, PS, PSFILE or SATISFY keyword.
The REM token is optional, providing that the remainder of the command cannot be mistaken
for another Remind command such as OMIT or RUN. The portion of the REM command before the
MSG, MSF RUN, CAL or SATISFY clause is called a trigger.
MSG, MSF, RUN, CAL, SPECIAL, PS and PSFILE
These keywords denote the type of the reminder. (SATISFY is more complicated and will be
explained later.) A MSG-type reminder normally prints a message to the standard output,
after passing the body through a special substitution filter, described in the section
"THE SUBSTITUTION FILTER." However, if you have used the -k command-line option, then
MSG-type reminders are passed to the appropriate program. Note that the options -c, -s,
-p and -n disable the -k option.
Note that you can omit the reminder type, in which case it defaults to MSG. So you can
write:
6 January Dianne's Birthday
although this is not recommended.
The MSF keyword is almost the same as the MSG keyword, except that the reminder is
formatted to fit into a paragraph-like format. Three system variables control the
formatting of MSF-type reminders - they are $FirstIndent, $SubsIndent and $FormWidth.
They are discussed in the section "SYSTEM VARIABLES." The MSF keyword causes the spacing
of your reminder to be altered - extra spaces are discarded, and two spaces are placed
after periods and other characters, as specified by the system variables $EndSent and
$EndSentIg. Note that if the body of the reminder includes newline characters (placed
there with the %_ sequence), then the newlines are treated as the beginnings of new
paragraphs, and the $FirstIndent indentation is used for the next line. You can use two
consecutive newlines to have spaced paragraphs emitted from a single reminder body.
A RUN-type reminder also passes the body through the substitution filter, but then
executes the result as a system command. A CAL-type reminder is used only to place
entries in the calendar produced when Remind is run with the -c, -s or -p options.
A PS or PSFILE-type reminder is used to pass PostScript code directly to the printer when
producing PostScript calendars. This can be used to shade certain calendar entries (see
the psshade() function), include graphics in the calendar, or almost any other purpose you
can think of. You should not use these types of reminders unless you are an expert
PostScript programmer. The PS and PSFILE reminders are ignored unless Remind is run with
the -p option. See the section "More about PostScript" for more details.
A SPECIAL-type reminder is used to pass "out-of-band" information from Remind to a
calendar-producing back-end. It should be followed by a word indicating the type of
special data being passed. The type of a special reminder depends on the back-end. For
the Rem2PS back-end, SPECIAL PostScript is equivalent to a PS-type reminder, and SPECIAL
PSFile is equivalent to a PSFILE-type reminder. The body of a SPECIAL reminder is
obviously dependent upon the back-end. A back-end must ignore a SPECIAL that it does not
recognize.
DATE SPECIFICATIONS
A date_spec consists of zero to four parts. These parts are day (day of month), month
(month name), year and weekday. Month and weekday are the English names of months and
weekdays. At least the first three characters must be used. The following are examples
of the various parts of a date_spec:
day: 1, 22, 31, 14, 3
month: JANUARY, feb, March, ApR, may, Aug
year: 1990, 1993, 2030. The year can range from 1990 to 2075.
weekday:
Monday, tue, Wed, THU, Friday, saturday, sundAy
Note that there can be several weekday components separated by spaces in a date_spec.
INTERPRETATION OF DATE SPECIFICATIONS
The following examples show how date specifications are interpreted.
1. Null date specification - the reminder is triggered every day. The trigger date for a
specific run is simply the current system date.
2. Only day present. The reminder is triggered on the specified day of each month. The
trigger date for a particular run is the closest such day to the current system date. For
example:
REM 1 MSG First of every month.
REM 31 MSG 31st of every month that has 31 days.
3. Only month present. The reminder is triggered every day of the specified month.
Example:
REM Feb MSG Every day in February
4. day and month present. Examples:
REM 6 Jan MSG Every 6th of January
REM Feb 29 MSG Every 29th of February
5. Only year present. Example:
REM 1991 MSG Every day in 1991
6. year and day present. Examples:
REM 1 1990 MSG 1st of every month in 1990
REM 1992 23 MSG 23rd of every month in 1992
7. year and month present. Examples:
REM Feb 1991 MSG Every day in Feb 1991
REM 1992 September MSG Every day in Sept 1992
8. year, month and day present. Examples:
REM 8 Jan 1991 MSG 8th January 1991.
REM 1992 March 9 MSG 9th March 1992.
9. weekday only. Examples:
REM Sat MSG Every Saturday
REM Mon Tue Wed Thu Fri MSG Every working day
REM Monday Wednesday MSG Every Monday and Wednesday
10. weekday and day present. Examples:
REM Sat 1 MSG First Saturday of every month
REM Mon Tue Wed Thu Fri 15 \
MSG 1st working day on or after 15th of every month
11. weekday and month present. Examples:
REM Mon March MSG Every Monday in March
REM Mon Tue Wed Thu Fri Feb MSG Every working day in February
12. weekday, month and day present. Examples:
REM Mon 1 March MSG First Monday in March
REM Sat Sun 15 July MSG First Sat or Sun on or after 15 July
13. weekday and year present. Example:
REM Sat Sun 1991 MSG Every Saturday and Sunday in 1991
14. weekday, day and year present. Examples:
REM Mon 15 1990 MSG 1st Mon after 15th of every month in 1990
REM Mon Tue Wed Thu Fri 1 1990 \
MSG 1st working day of every month in 1990
15. weekday, month and year present. Example:
REM Mon Wed 1991 Feb MSG Every Mon and Wed in Feb 1991.
16. weekday, day, month and year present. Example:
REM Mon Tue Wed Thu Fri 28 Oct 1990 \
MSG 1st working day on or after 28 October 1990.
Note that when both weekday and day are specified, Remind chooses the first date on or
after the specified day that also satisfies the weekday constraint. It does this by
picking the first date on or after the specified day that is listed in the list of
weekdays. Thus, a reminder like:
REM Mon Tue 28 Oct 1990 MSG Hi
would be issued only on Monday, 29 October, 1990. It would not be issued on Tuesday, 30
October, 1990, since the 29th is the first date to satisfy the weekday constraints.
SHORT-HAND DATE SPECIFICATIONS
In addition to spelling out the day, month and year separately, you can specify YYYY-MM-DD
or YYYY/MM/DD. For example, the following statements are equivalent:
REM 5 June 2010 MSG Cool!
REM 2010-06-05 MSG Cool!
You can also specify a date and time as YYYY-MM-DD@HH:MM. These statements are
equivalent:
REM 19 Dec 2010 AT 16:45 MSG Hi
REM 2010-12-19@16:45 MSG Hi
There's one subtlety with short-hand date specifications: The following statements are
not equivalent:
REM 19 Dec 2010 AT 16:45 +60 MSG Hi
REM 2010-12-19@16:45 +60 MSG Hi
In the second statement, the "+60" is a delta that applies to the date rather than a
tdelta that applies to the time. We recommend explicitly using the AT keyword with timed
reminders.
THE REMIND ALGORITHM
Remind uses the following algorithm to compute a trigger date: Starting from the current
date, it examines each day, one at a time, until it finds a date that satisfies the date
specification, or proves to itself that no such date exists. (Actually, Remind merely
behaves as if it used this algorithm; it would be much too slow in practice. Internally,
Remind uses much faster techniques to calculate a trigger date.) See DETAILS ABOUT
TRIGGER COMPUTATION for more information.
BACKWARD SCANNING
Sometimes, it is necessary to specify a date as being a set amount of time before another
date. For example, the last Monday in a given month is computed as the first Monday in
the next month, minus 7 days. The back specification in the reminder is used in this
case:
REM Mon 1 -7 MSG Last Monday of every month.
A back is specified with one or two dashes followed by an integer. This causes Remind to
move "backwards" from what would normally be the trigger date. The difference between --7
and -7 will be explained when the OMIT keyword is described.
ADVANCE WARNING
For some reminders, it is appropriate to receive advance warning of the event. For
example, you may wish to be reminded of someone's birthday several days in advance. The
delta portion of the REM command achieves this. It is specified as one or two "+" signs
followed by a number n. Again, the difference between the "+" and "++" forms will be
explained under the OMIT keyword. Remind will trigger the reminder on computed trigger
date, as well as on each of the n days before the event. Here are some examples:
REM 6 Jan +5 MSG Remind me of birthday 5 days in advance.
The above example would be triggered every 6th of January, as well as the 1st through 5th
of January.
PERIODIC REMINDERS
We have already seen some built-in mechanisms for certain types of periodic reminders.
For example, an event occurring every Wednesday could be specified as:
REM Wed MSG Event!
However, events that do not repeat daily, weekly, monthly or yearly require another
approach. The repeat component of the REM command fills this need. To use it, you must
completely specify a date (year, month and day, and optionally weekday); this is the start
date of the repetition period. The repeat component is an asterisk followed by a number
specifying the repetition period in days.
For example, suppose you get paid every second Wednesday, and your last payday was
Wednesday, 28 October, 1992. You can use:
REM 28 Oct 1992 *14 MSG Payday
This issues the reminder every 14 days, starting from 28 Oct 1992. You can use delta and
back with repeat. Note, however, that the back is used only to compute the starting date;
thereafter, the reminder repeats with the specified period. Similarly, if you specify a
weekday, it is used only to calculate the starting date, and does not affect the
repetition period.
SCANFROM and FROM
The SCANFROM and FROM keywords are for advanced Remind programmers only, and will be
explained in the section "DETAILS ABOUT TRIGGER COMPUTATION" near the end of this manual.
Note that SCANFROM is available only in versions of Remind from 03.00.04 up. FROM is
available only from 03.01.00 and later.
PRIORITY
The PRIORITY keyword must be followed by a number from 0 to 9999. It is used in calendar
mode and when sorting reminders. If two reminders have the same trigger date and time,
then they are sorted by priority. If the PRIORITY keyword is not supplied, a default
priority of 5000 is used. (This default can be changed by adjusting the system variable
$DefaultPrio. See the section "SYSTEM VARIABLES" for more information.)
EXPIRY DATES
Some reminders should be issued periodically for a certain time, but then expire. For
example, suppose you have a class every Friday, and that your last class is on 11 December
1992. You can use:
REM Fri UNTIL 11 Dec 1992 MSG Class today.
Another example: Suppose you have jury duty from 30 November 1992 until 4 December 1992.
The following reminder will issue the message every day of your jury duty, as well as 2
days ahead of time:
REM 1992-11-30 *1 +2 UNTIL 1992-12-04 MSG Jury duty
Note that the repeat of *1 is necessary; without it, the reminder would be issued only on
30 November (and the two days preceding.)
As a special case, you can use the THROUGH keyword instead of *1 and UNTIL. The following
two REM commands are equivalent:
REM 1992-11-30 *1 +2 UNTIL 1992-12-04 MSG Jury duty
REM 1992-11-30 +2 THROUGH 1992-12-04 MSG Jury duty
If you have an expiry date via the use of THROUGH or UNTIL, then Remind will never trigger
the reminder after the expiry date. For example, if you have this:
OMIT 2021-01-08
REM 2021-01-01 THROUGH 2021-01-08 AFTER MSG Test
the reminder will not be triggered on 2021-01-08, and nor will it be triggered on
2021-01-09; even though the AFTER keyword would normally move the 8th's reminder to the
9th, the expiry date of 2021-01-08 overrides that.
THE ONCE KEYWORD
Sometimes, it is necessary to ensure that reminders are run only once on a given day. For
example, if you have a reminder that makes a backup of your files every Friday:
REM Fri RUN do_backup
(Here, do_backup is assumed to be a program or shell script that does the work.) If you
run Remind from your .login script, for example, and log in several times per day, the
do_backup program will be run each time you log in. If, however, you use the ONCE keyword
in the reminder, the Remind checks the last access date of the reminder script. If it is
the same as the current date, Remind assumes that it has already been run, and will not
issue reminders containing the ONCE keyword.
Note that if you view or edit your reminder script, the last access date will be updated,
and the ONCE keyword will not operate properly. If you start Remind with the -o option,
then the ONCE keyword will be ignored.
LOCALLY OMITTING WEEKDAYS
The OMIT portion of the REM command is used to "omit" certain days when counting the delta
or back. It is specified using the keyword OMIT followed by a list of weekdays. Its
action is best illustrated with examples:
REM 1 +1 OMIT Sat Sun MSG Important Event
This reminder is normally triggered on the first of every month, as well as the day
preceding it. However, if the first of the month falls on a Sunday or Monday, then the
reminder is triggered starting from the previous Friday. This is because the delta of +1
does not count Saturday or Sunday when it counts backwards from the trigger date to
determine how much advance warning to give.
Contrast this with the use of "++1" in the above command. In this case, the reminder is
triggered on the first of each month, as well as the day preceding it. The omitted days
are counted.
REM 1 -1 OMIT Sat Sun MSG Last working day of month
Again, in the above example, the back of -1 normally causes the trigger date to be the
last day of the month. However, because of the OMIT clause, if the first of the month
falls on a Sunday or Monday, the trigger date is moved backwards past the weekend to
Friday. (If you have globally omitted holidays, the reminder will be moved back past
them, also. See "The OMIT command" for more details.)
By comparison, if we had used "--1", the reminder would be triggered on the last day of
the month, regardless of the OMIT.
If you locally omit weekdays but also have globally-omitted weekdays, then the list of
omitted weekdays is the union of the two. Consider this example:
OMIT Sat Sun
REM 15 OMIT Fri Sat MSG Whatever
In the REM command, the effective list of omitted weekdays will be Friday, Saturday and
Sunday.
COMPUTED LOCAL OMITS
The OMITFUNC phrase of the REM command allows you to supply a function that determines
whether or not a date is omitted. The function is passed a single parameter of type DATE,
and must return a non-zero integer if the date is considered "omitted" and 0 otherwise.
Here's an example:
FSET _third(x) (day(x) % 3) || \
(wkdaynum(x) == 0) || \
(wkdaynum(x) == 6)
REM OMITFUNC _third AFTER MSG Working day divisible by 3
In the example above, the reminder is triggered every Monday to Friday whose day-of-month
number is divisible by three. Here's how it works:
o The OMITFUNC _third portion causes all days for which _third(x) returns non-zero to
be considered "omitted". This causes all days whose day-of-month number is not a
multiple of three to be omitted. Note that _third also returns non-zero if the
weekday is Sunday or Saturday.
o The AFTER keyword causes the reminder to be moved after a block of omitted days.
The combination of OMITFUNC and AFTER keyword causes the reminder to be issued on all days
whose day-of-month number is divisible by three, but not on Saturday or Sunday.
Note that if you use OMITFUNC, then a local OMIT is ignored as are all global OMITs. If
you want to omit specific weekdays, your omit function will need to test for them
specifically. If you want to take into account the global OMIT context, then your omit
function will need to test for that explicitly (using the isomitted() function.)
Note that an incorrect OMITFUNC might cause all days to be considered omitted. For that
reason, when Remind searches through omitted days, it terminates the search after the
SATISFY iteration limit (command-line option -x.)
ADDING TRIGGER DATES TO THE OMIT CONTEXT
If the ADDOMIT keyword appears in a REM command, then the trigger date (if one could be
calculated) is automatically added to the list of global OMITs.
The command:
REM ... whatever ... ADDOMIT MSG Foo
is identical in behaviour to the sequence:
REM ... whatever ... SATISFY 1
IF trigvalid()
OMIT [trigdate()] MSG Foo
ENDIF
TIMED REMINDERS
Timed reminders are those that have an AT keyword followed by a time and optional tdelta
and trepeat. The time may be specified in 24-hour format, with 0:00 representing
midnight, 12:00 representing noon, and 23:59 representing one minute to midnight.
Alternatively, it may be specified in common "AM/PM" format; in this case, the hour must
range from 1 to 12. 12:00am represents midnight, 12:00pm represents noon, and 11:59pm
represents one minute to midnight. The "am" and "pm" portions are case-insensitive and
the "m" is optional.
You can use either a colon or a period to separate the hours from the minutes. That is,
13:39 and 13.39 are equivalent.
Remind treats timed reminders specially. If the trigger date for a timed reminder is the
same as the current system date, the reminder is queued for later activation. When Remind
has finished processing the reminder file, it puts itself in the background, and activates
timed reminders when the system time reached the specified time. Note that if you use the
NOQUEUE modifier in the REM command, then this queueing and background activation is not
performed. NOQUEUE is useful if you want a time to be associated with a reminder (eg, in
the calendar) but are not interested in a popup reminder happening at the specified time.
If the trigger date is not the same as the system date, the reminder is not queued.
For example, the following reminder, triggered every working day, will emit a message
telling you to leave at 5:00pm:
REM Mon Tue Wed Thu Fri AT 17:00 MSG Time to leave!
The following reminder will be triggered on Thursdays and Fridays, but will only be queued
on Fridays:
REM Fri ++1 AT 1:00PM MSG Lunch at 1pm Friday.
The tdelta and trepeat have the same form as a repeat and delta, but are specified in
minutes. For example, this reminder will be triggered at 12:00pm as well as 45 minutes
before:
REM AT 12:00 +45 MSG Example
The following will be issued starting at 10:45, every half hour until 11:45, and again at
noon.
REM AT 12:00 +75 *30 MSG Example2
The "+75" means that the reminder is issued starting 75 minutes before noon; in other
words, at 10:45. The *30 specifies that the reminder is subsequently to be issued every
30 minutes. Note that the reminder is always issued at the specified time, even if the
tdelta is not a multiple of the trepeat. So the above example is issued at 10:45am,
11:15am, 11:45am, and 12:00pm. Note that in the time specification, there is no
distinction between the "+" and "++" forms of tdelta.
Normally, Remind will issue timed reminders as it processes the reminder script, as well
as queuing them for later. If you do not want Remind to issue the reminders when
processing the script, but only to queue them for later, use the -a command-line option.
If you do not want reminders to be queued for later, use the -q command-line option.
Normally, Remind forks a background process to handle queued reminders. If you want
Remind to remain in the foreground, use the -f command-line option. This is useful, for
example, in .xinitrc scripts, where you can use the command:
remind -fa myreminders &
This ensures that when you exit X-Windows, the Remind process is killed.
WARNING ABOUT TIMED REMINDERS
Note: If you use user-defined functions or variables (described later) in the bodies of
timed reminders, then when the timed reminders are activated, the variables and functions
have the definitions that were in effect at the end of the reminder script. These
definitions may not necessarily be those that were in effect at the time the reminder was
queued.
THE SCHED AND WARN KEYWORDS
The SCHED keyword allows more precise control over the triggering of timed reminders, and
the WARN keyword allows precise control over the advance triggering of all types of
reminders. However, discussion must be deferred until after expressions and user-defined
functions are explained. See the subsection "PRECISE SCHEDULING" further on.
TAG AND DURATION
The TAG keyword lets you "tag" certain reminders. This facility is used by certain back-
ends or systems built around Remind, such as TkRemind. These back-ends have specific
rules about tags; see their documentation for details.
The TAG keyword is followed by a tag consisting of up to 48 characters. You can have as
many TAG clauses as you like in a given REM statement. A tag can contain any character
except for whitespace and a comma.
If you supply the -y option to Remind, then any reminder that lacks a TAG will have one
synthesized. The synthesized tag consists of the characters "__syn__" followed by the
hexadecimal representation of the MD5 sum of the REM command line. This lets you give a
more-or-less unique identifier to each distinct REM command.
The DURATION keyword makes sense only for timed reminders; it specifies the duration of an
event. For example, if you have a 90-minute meeting starting at 1:00pm, you could use any
of the following:
REM 5 March 2021 AT 13:00 DURATION 1:30 MSG Meeting
REM 5 March 2021 AT 13:00 DURATION 90 MSG Meeting
REM 5 March 2021 AT 1:00pm DURATION 1:30 MSG Meeting
REM 5 March 2021 AT 1:00pm DURATION 90 MSG Meeting
For long-duration reminders, it is convenient to use expressions to simplify writing the
DURATION. For example, if you are away from 20 Feb 2023 through 23 Feb 2023 (a total of 4
days) you could write:
REM 20 Feb AT 00:00 DURATION [4*24]:00 MSG away
REM 20 Feb AT 00:00 DURATION [4*24*60] MSG away
Note that duration is specified either as hours:minutes or just as minutes specified as an
integer.
If you specify a duration of 00:00 or 0, then Remind behaves exactly as if no DURATION at
all had been present. Although durations specified as hours:minutes look superficially
like a time-of-day, they are not; the hours component is not limited to the range 00-23.
SYNTACTIC SUGAR FOR REM
The REM command has syntactic sugar to let you express common reminders. The following
pairs of reminders are equivalent:
REM First Monday April MSG Foo
REM Mon 1 April MSG Foo
REM Second Monday May MSG Bar
REM Mon 8 May MSG Bar
REM Third Monday MSG Third Monday of every month
REM Mon 15 MSG Third Monday of every month
REM Fourth Sunday June 2025 MSG Fourth Sunday in June 2025
REM Sun 22 June 2025 MSG Fourth Sunday in June 2025
REM Last Monday MSG Last Monday of every month
REM Mon 1 --7 MSG Last Monday of every month
REM Last Monday April MSG Last Monday of every April
REM Mon 1 May --7 MSG Last Monday of every April
REM Last Monday December 2025 MSG Last Monday of Dec 2025
REM Monday 1 Jan 2026 --7 MSG Last Monday of Dec 2025
Note that Last effectively adjusts the month and year, if necessary, to make the reminder
trigger on the correct date.
The keyword IN is completely ignored, so you can write (for example):
REM Second Monday in May MSG foo
REM Last Monday in December 2025 MSG Bar
An alternate form of back makes writing reminders easier. The following groups of
reminders are equivalent:
REM ~~1 MSG Last day of every month
REM Lastday MSG Last day of every month
REM 1 --1 MSG Last day of every month
REM May ~~1 MSG Last day of May
REM Lastday May MSG Last day of May
REM 1 June --1 MSG Last day of May
REM Dec 2025 ~~1 MSG Last day of December 2025
REM Lastday Dec 2025 MSG Last day of December 2025
REM 1 Jan 2026 --1 MSG Last day of December 2025
REM Apr ~1 OMIT SAT SUN MSG Last workday of April
REM Lastworkday April OMIT SAT SUN MSG Last workday of April
REM 1 May -1 OMIT SAT SUN MSG Last workday of April
REM Apr ~~7 MSG Seventh-last day of April
REM 1 May --7 MSG Seventh-last day of April
REM Apr ~2 OMIT SAT SUN MSG Second-last workday of April
REM 1 May -2 OMIT SAT SUN MSG Second-last workday of April
As we see, "Lastday" is equivalent to ~~1 and "Lastworkday" to ~1.
Note that the First/Second/Third/Fourth/Last keywords and the ~ and ~~ form of back imply
a value for the day of the month; as such, they cannot be combined with a day.
Additionally, First/Second/Third/Fourth/Last must have at least one weekday name. The
following are illegal:
REM First Monday 3 June MSG Huh?
REM April 3 ~~1 MSG What?
REM Second June MSG Where's the weekday???
THE SUBSTITUTION FILTER
Before being processed, the body of a REM command is passed through a substitution filter.
The filter scans for sequences "%x" (where "x" is any letter and certain other characters)
and performs substitutions as shown below. (All dates refer to the trigger date of the
reminder.)
%a is replaced with "on weekday, day month, year"
For example, consider the reminder:
REM 18 Oct 1990 +4 MSG Meeting with Bob %a.
On 16 October 1990, it would print "Meeting with Bob on Thursday, 18 October,
1990."
On 17 October 1990, it would print "Meeting with Bob tomorrow."
On 18 October 1990, it would print "Meeting with Bob today."
%b is replaced with "in diff day's time" where diff is the actual number of days
between the current date and the trigger date. (OMITs have no effect.)
For example, consider:
REM 18 Oct 1990 +4 MSG Meeting with Bob %b.
On 16 October 1990, it would print "Meeting with Bob in 2 days' time."
On 17 October 1990, it would print "Meeting with Bob tomorrow."
On 18 October 1990, it would print "Meeting with Bob today."
%c is replaced with "on weekday"
Example: REM 18 Oct 1990 +4 MSG Meeting with Bob %c.
On 16 October 1990, it would print "Meeting with Bob on Thursday."
On 17 October 1990, it would print "Meeting with Bob tomorrow."
On 18 October 1990, it would print "Meeting with Bob today."
%d is replaced with "day", the day of the month.
%e is replaced with "on dd-mm-yyyy"
%f is replaced with "on mm-dd-yyyy"
%g is replaced with "on weekday, day month"
%h is replaced with "on dd-mm"
%i is replaced with "on mm-dd"
%j is replaced with "on weekday, month day-th, year" This form appends the characters
"st", "nd", "rd" or "th" to the day of the month, as appropriate.
%k is replaced with "on weekday, month day-th"
%l is replaced with "on yyyy-mm-dd"
%m is replaced with "month", the name of the month.
%n is replaced with the number (1 to 12) of the month.
%o is replaced with " (today)" if and only if the current system date is the same as
the date being used by Remind as the current date. Recall that you can specify a
date for Remind to use on the command line. This substitution is not generally
useful in a REM command, but is useful in a BANNER command. (See "The BANNER
Command.")
%p is replaced with "s" if the diff between the current date and the trigger date is
not 1. You can use this to construct reminders like:
REM 1 Jan +4 MSG %x day%p to go before New Year!
%q is replaced with "'s" if the diff between the trigger date and the current date is
1. Otherwise, it is replaced with "s'" This can be used as follows:
REM 1 Jan +4 MSG New Year in %x day%q time!
%r is replaced with the day of the month (01 to 31) padded with a leading zero if
needed to pad to two digits.
%s is replaced with "st", "nd", "rd" or "th" depending on the day of the month.
%t is replaced with the number of the month (01 to 12) padded to two digits with a
leading zero.
%u is replaced with "on weekday, day-th month, year" This is similar to %a except
that "st", "nd", "rd" or "th" is added to the day as appropriate.
%v is replaced with "on weekday, day-th month"
%w is replaced with "weekday", the name of the day of the week.
%x is replaced with the diff between the current date and the trigger date. The diff
is defined as the actual number of days between these two dates; OMITs are not
counted. (Strict date subtraction is performed.)
%y is replaced with "year", the year of the trigger date.
%z is replaced with "yy", the last two digits of the year.
%_ (percent-underscore) is replaced with a newline. You can use this to achieve
multi-line reminders.
%1 is replaced with "now", "m minutes from now", "m minutes ago", "h hours from now",
"h hours ago", "h hours and m minutes from now" or "h hours and m minutes ago", as
appropriate for a timed reminder. Note that unless you specify the -a option,
timed reminders will be triggered like normal reminders, and thus a timed reminder
that occurred earlier in the day may be triggered. This causes the need for the
"...ago" forms.
%2 is replaced with "at hh:mmam" or "..pm" depending on the AT time of the reminder.
%3 is replaced with "at hh:mm" in 24-hour format.
%4 is replaced with "mm" where mm is the number of minutes between "now" and the time
specified by AT. If the AT time is earlier than the current time, then the result
is negative.
%5 is replaced with "ma" where ma is the absolute value of the number produced by %4.
%6 is replaced with "ago" or "from now", depending on the relationship between the AT
time and the current time.
%7 is replaced with the number of hours between the AT time and the current time. It
is always non-negative.
%8 is replaced with the number of minutes between the AT time and the current time,
after the hours (%7) have been subtracted out. This is a number ranging from 0 to
59.
%9 is replaced with "s" if the value produced by %8 is not 1.
%0 is replaced with "s" if the value produced by %7 is not 1.
%! is replaced with "is" if the current time is before the AT time, or "was" if it is
after.
%@ is similar to %2 but displays the current time.
%# is similar to %3 but displays the current time.
%" (percent-doublequote - ") is removed. This sequence is not used by the
substitution filter, but is used to tell Remind which text to include in a calendar
entry when the -c, -s or -p option is chosen. See "CALENDAR MODE"
Notes:
o Remind normally prints a blank line after each reminder; if the last character of
the body is "%", the blank line will not be printed. You can globally suppress the
extra blank lines by setting $AddBlankLines to 0.
o Substitutions a, b, c, e, f, g, h, i, j, k, l, u and v all are replaced with
"today" if the current date equals the trigger date, or "tomorrow" if the trigger
date is one day after the current date. Thus, they are not the same as
substitutions built up from the simpler %w, %y, etc. sequences.
o The a, c, e, f, g, h, i, j, k, l, u, v, 2, and 3 substitutions may be preceded by
an asterisk (for example, %*c) which causes the word "at" or "on" that would
normally be included in the output to be omitted.
o Any of the substitutions dealing with time (0 through 9 and '!') produce undefined
results if used in a reminder that does not have an AT keyword. Also, if a
reminder has a delta and may be triggered on several days, the time substitutions
ignore the date. Thus, the %1 substitution may report that a meeting is in 15
minutes, for example, even though it may only be in 2 days time, because a delta
has triggered the reminder. It is recommended that you use the time substitutions
only in timed reminders with no delta that are designed to be queued for timed
activation.
o Capital letters can be used in the substitution sequence, in which case the first
character of the substituted string is capitalized (if it is normally a lower-case
letter.)
o All other characters following a "%" sign are simply copied. In particular, to get
a "%" sign out, use "%%" in the body. To start the body of a reminder with a
space, use "% ", since Remind normally scans for the first non-space character
after a MSG, CAL or RUN token.
THE OMIT COMMAND
In addition to being a keyword in the REM command, OMIT is a command in its own right.
Its syntax is:
OMIT weekday [weekday...]
or:
OMIT [day] month [year]
or:
OMIT [day1] month1 [year1] THROUGH [day2] month2 [year2]
The OMIT command is used to "globally" omit certain days (usually holidays). These
globally-omitted days are skipped by the "-" and "+" forms of back and delta, but not by
the "--" and "++" forms. Some examples:
OMIT Saturday Sunday
OMIT 1 Jan
OMIT 7 Sep 1992
OMIT 15 Jan THROUGH 14 Feb
OMIT May # Equivalent to OMIT May 1 THROUGH May 31
OMIT 25 Dec THROUGH 4 Jan
OMIT 2023-05-03 THROUGH 2023-05-12
OMIT Jun THROUGH July # Equivalent to OMIT Jun 1 THROUGH July 31
The first example omits every Saturday and Sunday. This is useful for reminders that
shouldn't trigger on weekends.
The second example specifies a holiday that occurs on the same date each year - New Year's
Day.
The third example specifies a holiday that changes each year - Labour Day. For these
types of holidays, you must create an OMIT command for each year. (Later, in the
description of expressions and some of the more advanced features of Remind, you will see
how to automate this for some cases.)
As with the REM command, you can use shorthand specifiers for dates; the following are
equivalent:
OMIT 7 Sep 1992
OMIT 1992-09-07
For convenience, you can use a delta and MSG or RUN keyword in the OMIT command. The
following sequences are equivalent:
OMIT 1 Jan
REM 1 Jan +4 MSG New year's day is %b!
and
OMIT 1 Jan +4 MSG New year's day is %b!
The THROUGH keyword lets you conveniently OMIT a range of days. For example, the
following sequences are equivalent:
OMIT 3 Jan 2011
OMIT 4 Jan 2011
OMIT 5 Jan 2011
and
OMIT 3 Jan 2011 THROUGH 5 Jan 2011
You can make a THROUGH OMIT do double-duty as a REM command as long as both dates are
fully specified
OMIT 6 Sep 2010 THROUGH 10 Sep 2010 MSG Vacation
If you use a THROUGH clause, then either the year must be supplied before and after the
THROUGH, or it must be missing before and after the THROUGH. The following are legal:
OMIT 25 Dec THROUGH 6 Jan
OMIT 25 Dec 2024 THROUGH 6 Jan 2025
But the following are not:
OMIT 25 Dec THROUGH 6 Jan 2025
OMIT 25 Dec 2024 THROUGH 6 Jan
You can debug your global OMITs with the following command:
OMIT DUMP
The OMIT DUMP command prints the current global omits to standard output.
THE BEFORE, AFTER AND SKIP KEYWORDS
Normally, days that are omitted, whether by a global OMIT command or the local OMIT or
OMITFUNC keywords in a REM statement, only affect the counting of the -back or the +delta.
For example, suppose you have a meeting every Wednesday. Suppose, too, that you have
indicated 11 Nov as a holiday:
OMIT 11 Nov +4 MSG Remembrance Day
REM Wed +1 MSG Code meeting %b.
The above sequence will issue a reminder about a meeting for 11 November 1992, which is a
Wednesday. This is probably incorrect. There are three options:
BEFORE This keyword moves the reminder to before any omitted days. Thus, in the above
example, use of BEFORE would cause the meeting reminder to be triggered on Tuesday,
10 November 1992.
AFTER This keyword moves the reminder to after any omitted days. In the above example,
the meeting reminder would be triggered on Thursday, 12 November 1992.
SKIP This keyword causes the reminder to be skipped completely on any omitted days.
Thus, in the above example, the reminder would not be triggered on 11 November
1992. However, it would be triggered as usual on the following Wednesday, 18
November 1992.
The BEFORE and AFTER keywords move the trigger date of a reminder to before or after a
block of omitted days, respectively. Suppose you normally run a backup on the first day
of the month. However, if the first day of the month is a weekend or holiday, you run the
backup on the first working day following the weekend or holiday. You could use:
REM 1 OMIT Sat Sun AFTER RUN do_backup
Let's examine how the trigger date is computed. The 1 specifies the first day of the
month. The local OMIT keyword causes the AFTER keyword to move the reminder forward past
weekends. Finally, the AFTER keyword will keep moving the reminder forward until it has
passed any holidays specified with global OMIT commands.
THE DO AND INCLUDE COMMANDS
Remind allows you to include other files in your reminder script, similar to the C
preprocessor #include directive. For example, your system administrator may maintain a
file of holidays or system-wide reminders. You can include these in your reminder script
as follows:
INCLUDE /usr/share/remind/holidays
INCLUDE /usr/share/remind/reminders
(The actual pathnames vary from system to system - ask your system administrator.)
INCLUDE files can be nested up to a depth of 8.
If you specify a filename of "-" in the INCLUDE command, Remind will begin reading from
standard input.
If you specify a directory as the argument to INCLUDE, then Remind will process all files
in that directory that match the shell patterm "*.rem". The files are processed in sorted
order; the sort order matches that used by the shell when it expands "*.rem".
Note that the file specified by an INCLUDE command is interpreted relative to the current
working directory of the Remind process. If you want to include a file relative to the
directory containing the currently-processing file, use DO instead. For example, if the
current file is /home/user/.reminders/foo.rem and Remind's working directory is
/home/user, then:
# Read /home/user/.reminders/bar.rem
DO bar.rem
# Read /usr/share/bar.rem - absolute path
DO /usr/share/bar.rem
# Read /home/user/bar.rem
INCLUDE bar.rem
# Read /usr/share/bar.rem - absolute path
INCLUDE /usr/share/bar.rem
Arguably, the INCLUDE command should have worked the way DO does right from the start, but
changing it would have broken backward-compatibility, hence the introduction of DO.
Note that if the currently-processing reminders file was specified as a symbolic link to a
file that is not in the same directory as the symbolic link itself, DO will fail. Remind
does not resolve the real path of symbolic links, so you should avoid using symbolic links
to files.
THE RUN COMMAND
If you include other files in your reminder script, you may not always entirely trust the
contents of the other files. For example, they may contain RUN-type reminders that could
be used to access your files or perform undesired actions. The RUN command can restrict
this: If you include the command RUN OFF in your top-level reminder script, any reminder
or expression that would normally execute a system command is disabled. RUN ON will re-
enable the execution of system commands. Note that the RUN ON command can only be used in
your top-level reminder script; it will not work in any files accessed by the INCLUDE
command. This is to protect you from someone placing a RUN ON command in an included
file. However, the RUN OFF command can be used at top level or in an included file.
If you run Remind with the -r command-line option, RUN-type reminders and the shell()
function will be disabled, regardless of any RUN commands in the reminder script.
However, any command supplied with the -k option will still be executed.
One use of the RUN command is to provide a secure interface between Remind and the Elm
mail system. The Elm system can automatically scan incoming mail for reminder or calendar
entries, and place them in your calendar file. To use this feature, you should set the
calendar filename option under Elm to be something like "~/.reminders.in", not your main
reminder file! This is so that any RUN ON commands mailed to you can never be activated.
Then, you can use the Elm scan message for calendar entries command to place reminders
prefaced by "->" into .reminders.in. In your main .reminders file, include the following
lines:
RUN OFF # Disable RUN
INCLUDE .reminders.in
RUN ON # Re-enable RUN
In addition, Remind contains a few other security features. It will not read a file that
is group- or world-writable. It will not run set-uid. If it reads a file you don't own,
it will disable RUN and the shell() function. And if it is run as root, it will only read
files owned by root.
Note that if Remind reads standard input, it does not attempt to check the ownership of
standard input, even if it is coming from a file, and hence does not disable RUN and
shell() in this situation.
THE INCLUDECMD COMMAND
Remind allows you to execute a shell command and evaluate the output of that command as if
it were an included file. For example, you could have scripts that extract reminders out
of a database and print them on stdout as REM commands. Here is an example:
INCLUDECMD extract_reminders_for dfs
We assume that the command "extract_reminders_for" extracts reminders out of a central
database for the named user. Another use-case of INCLUDECMD is if you have your reminders
stored in a file in some non-Remind format; you can write a command that transforms them
to Remind format and then Remind can "include" the file with an appropriate INCLUDECMD
command.
Note that if RUN is disabled, then INCLUDECMD will fail with the error message "RUN
disabled"
INCLUDECMD passes the rest of the line to popen(3), meaning that the command is executed
by the shell. As such, shell metacharacters may need escaping or arguments quoting,
depending on what you're trying to do. Remind itself does not perform any modification of
the command line (apart from the normal [expr] expression-pasting mechanism).
If the command passed to INCLUDECMD begins with an exclamation mark "!", then Remind
disables RUN for the output of the command. If you are running a command whose output you
don't quite trust, you should prefix it with "!" so that any RUN commands it emits fail.
An INCLUDECMD command counts towards the INCLUDE nesting depth. For any given Remind run,
a given INCLUDECMD command is only executed once and the results are cached. For example,
if you generate a calendar, each unique INCLUDECMD command is run just once, not once for
each day of the produced calendar. "Uniqueness" is determined by looking at the command
that will be passed to the shell, so if (for example) your INCLUDECMD uses expression-
pasting that results in differences depending on the value of today(), then each unique
version of the command will be executed once.
THE BANNER COMMAND
When Remind first issues a reminder, it prints a message like this:
Reminders for Friday, 30th October, 1992 (today):
(The banner is not printed if any of the calendar-producing options is used, or if the -k
option is used.)
The BANNER command lets you change the format. It should appear before any REM commands.
The format is:
BANNER format
The format is similar to the body of a REM command. It is passed through the substitution
filter, with an implicit trigger of the current system date. Thus, the default banner is
equivalent to:
BANNER Reminders for %w, %d%s %m, %y%o:
You can disable the banner completely with BANNER %. Or you can create a custom banner:
BANNER Hi - here are your reminders for %y-%t-%r:
CONTROLLING THE OMIT CONTEXT
Sometimes, it is necessary to temporarily change the global OMITs that are in force for a
few reminders. Three commands allow you to do this:
PUSH-OMIT-CONTEXT
This command saves the current global OMITs on an internal stack.
CLEAR-OMIT-CONTEXT
This command clears all of the global OMITs, starting you off with a "clean slate."
POP-OMIT-CONTEXT
This command restores the global OMITs that were saved by the most recent PUSH-
OMIT-CONTEXT.
For example, suppose you have a block of reminders that require a clear OMIT context, and
that they also introduce unwanted global OMITs that could interfere with later reminders.
You could use the following fragment:
PUSH-OMIT-CONTEXT # Save the current context
CLEAR-OMIT-CONTEXT # Clean the slate
# Block of reminders goes here
POP-OMIT-CONTEXT # Restore the saved omit context
EXPRESSIONS
In certain contexts, to be described later, Remind will accept expressions for evaluation.
Remind expressions resemble C expressions, but operate on different types of objects.
DATA TYPES
Remind expressions operate on five types of objects:
INT The INT data type consists of the integers representable in one machine word. The
INT data type corresponds to the C "int" type.
STRING The STRING data type consists of strings of characters. It is somewhat comparable
to a C character array, but more closely resembles the string type in BASIC.
TIME The TIME data type is used for two different purposes: To represent a time of day
with one-minute precision or to represent a duration with one-minute precision.
The context of where a TIME is used determines whether it is interpreted as a time
of day or a duration.
In contexts where a TIME represents a time of day, it may range from 00:00 to 23:59
and is stored internally as an integer from 0 to 1439 representing the number of
minutes since midnight.
In contexts where a TIME represents a duration, there is no upper limit on the hour
component (beyond that imposed by the restriction that a duration expressed in
minutes must fit into the signed integer type of your CPU architecture.)
Internally, a duration is stored as an integer number of minutes.
DATE The DATE data type consists of dates (later than 1 January 1990.) Internally, DATE
objects are stored as the number of days since 1 January 1990.
DATETIME
The DATETIME data type consists of a date and time together. Internally, DATETIME
objects are stored as the number of minutes since midnight, 1 January 1990. You
can think of a DATETIME object as being the combination of DATE and TIME parts.
CONSTANTS
The following examples illustrate constants in Remind expressions:
INT constants
12, 36, -10, 0, 1209
STRING constants
"Hello there", "This is a test", "\nHello\tThere", ""
Note that the empty string is represented by "". Remind supports the escape
sequences "\a", "\b", "\f", "\n", "\r", "\t" and "\v" which have the same meanings
as their counterparts in C. To include a quote in a string, use "\"". Any other
character preceded by a backslash is inserted into the string as-is, but the
backslash itself is removed. To include a backslash in a string, use "\\".
TIME constants
12:33, 0:01, 14:15, 16:42, 12.16, 13.00, 1.11, 4:30PM, 12:20am
Note that TIME constants may be written in 24-hour format or in common "AM/PM"
format. If you use "AM/PM" format, then the hour can range from 1 to 12. Either a
period or colon can be used to separate the minutes from the hours. However,
Remind will consistently output times in 24-hour format using only one separator
character. (The output separator character is chosen at compile-time.)
If the TIME is used where Remind expects a time-of-day (for example, in an AT
clause), then it can be written in 24-hour format (ranging from 00:00 to 23:59) or
12-hour format (ranging from 12:00am to 11:59pm). If the TIME is used where Remind
expects a duration, it must not have an am or pm suffix and the hour can be as
large as you want, so long as the total number of minutes in the duration fits in a
signed integer variable.
DATE constants
DATE constants are expressed as 'yyyy/mm/dd' or 'yyyy-mm-dd', and the single quotes
must be supplied. This distinguishes date constants from division or subtraction
of integers. Examples:
'1993/02/22', '1992-12-25', '1999/01/01'
Note that DATE values are printed without the quotes. Although either '-' or '/'
is accepted as a date separator on input, when dates are printed, only one will be
used. The choice of whether to use '-' or '/' is made at compile-time. Note also
that versions of Remind prior to 03.00.01 did not support date constants. In those
versions, you must create dates using the date() function. Also, versions prior to
03.00.02 did not support the '-' date separator.
DATETIME constants
DATETIME constants are expressed similarly to DATE constants with the addition of
an "@HH:MM" part, optionally followed by "am" or "pm". For example:
'2008-04-05@23:11', '1999/02/03@14:06', '2001-04-07@08:30', '2020-01-01@3:20pm'
DATETIME values are printed without the quotes. Notes about date and time
separator characters for DATE and TIME constants apply also to DATETIME constants.
ZERO VALUES
The non-string types all have an associated zero value, which is treated as "false" by the
IF command and the logical operators. The zero values are:
INT - 0
DATE - '1990-01-01'
TIME - 00:00
DATETIME - '1990-01-01@00:00'
Additionally, for the purpose of the IF command (but not the logical operators) the empty
string "" is considered a false value.
OPERATORS
Remind has the following operators. Operators on the same line have equal precedence,
while operators on lower lines have lower precedence than those on higher lines. The
operators approximately correspond to C operators.
! - (unary logical negation and arithmetic negation)
* / %
+ -
< <= > >=
== !=
&&
||
DESCRIPTION OF OPERATORS
! Logical negation. Can be applied to an INT type. If the operand is non-zero,
returns zero. Otherwise, returns 1.
- Unary minus. Can be applied to an INT. Returns the negative of the operand.
* Multiplication. Returns the product of two INTs.
/ Integer division. Returns the quotient of two INTs, discarding the remainder.
% Modulus. Returns the remainder upon dividing one INT by another.
+ Has several uses. These are:
INT + INT - returns the sum of two INTs.
INT + TIME or TIME + INT - returns a TIME obtained by adding INT minutes to the
original TIME. The result will always range from 00:00 through 23:59.
TIME + TIME treats the second TIME parameter as a duration, converting it to an
integer number of minutes past midnight, and then performs addition as with TIME +
INT.
INT + DATE or DATE + INT - returns a DATE obtained by adding INT days to the
original DATE.
INT + DATETIME or DATETIME + INT - returns a DATETIME obtained by adding INT
minutes to the original DATETIME.
DATETIME + TIME or TIME + DATETIME treats the TIME parameter as a duration,
converting it to an integer number of minutes past midnight, and then performs
addition as with DATETIME + INT.
STRING + STRING - returns a STRING that is the concatenation of the two original
STRINGs.
STRING + anything or anything + STRING - converts the non-STRING argument to a
STRING, and then performs concatenation. See the coerce() function.
- Has several uses. These are:
INT - INT - returns the difference of two INTs.
DATE - DATE - returns (as an INT) the difference in days between two DATEs.
TIME - TIME - returns (as an INT) the difference in minutes between two TIMEs.
DATETIME - DATETIME - returns (as an INT) the difference in minutes between two
DATETIMEs.
DATE - INT - returns a DATE that is INT days earlier than the original DATE.
TIME - INT - returns a TIME that is INT minutes earlier than the original TIME.
DATETIME - INT - returns a DATETIME that is INT minutes earlier than the original
DATETIME.
DATETIME - TIME - coerces the TIME to an INT and then performs subtraction as
above.
<, <=, >, and >=
These are the comparison operators. They can take operands of any type, but both
operands must be of the same type. The comparison operators return 1 if the
comparison is true, or 0 if it is false. Note that string comparison is done
following the lexical ordering of characters on your system, and that upper and
lower case are distinct for these operators.
==, != == tests for equality, returning 1 if its operands are equal, and 0 if they are
not. != tests for inequality.
If the operands are not of the same type, == returns 0 and != returns 1. Again,
string comparisons are case-sensitive.
&& This is the logical AND operator. Both of its operands must be of the same type
and must not be STRING type. Returns the second operand if both operands are non-
zero. Otherwise, returns a zero of the same type as the operands.
|| This is the logical OR operator. Both of its operands must be of the same type and
must not be of STRING type. It returns the first operand that is non-zero; if both
operands are zero, then returns a zero of the same type as the operands.
NOTES
If the result of an addition, subtraction or multiplication operation would not fit in a C
"int" type, Remind issues a "Number too high" error. Unlike C, integer operations will
not simply give the wrong answer in case of overflow.
Operators of equal precedence are always evaluated from left to right, except where
parentheses dictate otherwise. This is important, because the enhanced "+" operator is
not necessarily associative. For example:
1 + 2 + "string" + 3 + 4 yields "3string34"
1 + (2 + "string") + (3 + 4) yields "12string7"
12:59 + 1 + "test" yields "13:00test"
12:59 + (1 + "test") yields "12:591test"
The logical operators are not so-called short-circuit operators, as they are in C. Both
operands are always evaluated. Thus, an expression such as:
(f!=0) && (100/f <= 3)
will cause an error if f is zero.
VARIABLES
Remind allows you to assign values to variables. The SET command is used as follows:
SET var expr
Var is the name of a variable. It must start with a letter or underscore, and consist
only of letters, digits and underscores. Only the first 64 characters of a variable name
are significant. Variable names are not case sensitive; thus, "Afoo" and "afOo" are the
same variable. Examples:
SET a 10 + (9*8)
SET b "This is a test"
SET mydir getenv("HOME")
SET time 12:15
SET date today()
Note that variables themselves have no type. They take on the type of whatever you store
in them.
Variables set with SET or on the command-line with -ivar=expr have global scope.
To delete a variable, use the UNSET command:
UNSET var [var...]
For example, to delete all the variables declared above, use:
UNSET a b mydir time date
SYSTEM VARIABLES
In addition to the regular user variables, Remind has several "system variables" that are
used to query or control the operating state of Remind. System variables are available
starting from version 03.00.07 of Remind.
All system variables begin with a dollar sign '$'. They can be used in SET commands and
expressions just as regular variables can. All system variables always hold values of a
specified type. In addition, some system variables cannot be modified, and you cannot
create new system variables. System variables can be initialized on the command line with
the -i option, but you may need to quote them to avoid having the shell interpret the
dollar sign. System variable names are not case-sensitive.
The following system variables are defined. Those marked "read-only" cannot be changed
with the SET command. All system variables hold values of type INT, unless otherwise
specified.
$AddBlankLines
If set to 1 (the default), then Remind normally prints a blank line after the
banner and each reminder. (This can be suppressed by ending the reminder or banner
with a single percent sign.) If $AddBlankLines is set to 0, then Remind does not
print the blank line. In this case, ending a reminder with % has no effect. If
you do want a blank line after a reminder, end it with %_ to insert a newline.
$CalcUTC
If 1 (the default), then Remind uses C library functions to calculate the number of
minutes between local and Universal Time Coordinated. This affects astronomical
calculations (sunrise() for example.) If 0, then you must supply the number of
minutes between local and Universal Time Coordinated in the $MinsFromUTC system
variable.
$CalMode (read-only)
If non-zero, then the -c option was supplied on the command line.
$Daemon (read-only)
If the daemon mode -z was invoked, contains the number of minutes between wakeups.
If not running in daemon mode, contains 0.
$DateSep
This variable can be set only to "/" or "-". It holds the character used to
separate portions of a date when Remind prints a DATE or DATETIME value.
$DefaultColor
This variable can be set to a string that has the form of three space-separated
numbers. Each number must be an integer from 0 to 255, or all three numbers must
be -1. The default value of $DefaultColor is "-1 -1 -1", which suppresses default
coloring of MSG-type reminders. If you set $DefaultColor to any other value, then
all MSG-, MSF- and CAL-type reminders are effectively converted into SPECIAL COLOR
reminders whose color value is specified by $DefaultColor.
Unlike other system variables, the value of $DefaultColor is not preserved between
calendar iterations; rather, it is reset to "-1 -1 -1" at the start of each
iteration.
$DefaultPrio
The default priority assigned to reminders without a PRIORITY clause. You can set
this as required to adjust the priorities of blocks of reminders without having to
type priorities for individual reminders. At startup, $DefaultPrio is set to 5000;
it can range from 0 to 9999.
$DefaultTDelta
The default time delta used if no +N is given in an AT clause. This is normally 0,
but can be set with the -tt option or explicitly set in your script. If
$DefaultDelta is non-zero, you can use an explicit delta of +0 in an AT clause to
countermand the default delta.
$DontFork (read-only)
If non-zero, then the -c option was supplied on the command line.
$DontTrigAts (read-only)
The number of times that the -a option was supplied on the command line.
$DontQueue (read-only)
If non-zero, then the -q option was supplied on the command line.
$EndSent (STRING type)
Contains a list of characters that end a sentence. The MSF keyword inserts two
spaces after these characters. Initially, $EndSent is set to ".!?" (period,
exclamation mark, and question mark.)
$EndSentIg (STRING type)
Contains a list of characters that should be ignored when MSF decides whether or
not to place two spaces after a sentence. Initially, is set to "'>)]}"+CHAR(34)
(single-quote, greater-than, right parenthesis, right bracket, right brace, and
double-quote.)
For example, the default values work as follows:
MSF He said, "Huh! (Two spaces will follow this.)" Yup.
because the final parenthesis and quote are ignored (for the purposes of spacing)
when they follow a period.
$FirstIndent
The number of spaces by which to indent the first line of a MSF-type reminder. The
default is 0.
$FoldYear
The standard Unix library functions may have difficulty dealing with dates later
than 2037. If this variable is set to 1, then the UTC calculations "fold back"
years later than 2037 before using the Unix library functions. For example, to
find out whether or not daylight saving time is in effect in June, 2077, the year
is "folded back" to 2010, because both years begin on a Monday, and both are non-
leapyears. The rules for daylight saving time are thus presumed to be identical
for both years, and the Unix library functions can handle 2010. By default, this
variable is 0. Set it to 1 if the sun or UTC functions misbehave for years greater
than 2037.
$FormWidth
The maximum width of each line of text for formatting MSF-type reminders. The
default is the width of the terminal in columns, minus 8, but clamped at a minimum
of 20 and a maximum of 500. If standard output is not a terminal, then the default
is 72.If an MSF-type reminder contains a word too long to fit in this width, it
will not be truncated - the width limit will be ignored.
$HushMode (read-only)
If non-zero, then the -h option was supplied on the command line.
$IgnoreOnce (read-only)
If non-zero, then the -o option was supplied on the command line, or a date
different from today's true date was supplied. If non-zero, then ONCE directives
will be ignored.
$InfDelta (read-only)
If non-zero, then the -t option was supplied on the command line.
$IntMax (read-only)
The largest representable INT. On a machine with 32-bit signed integers using
twos-complement representation, this will be 2147483647.
$IntMin (read-only)
The smallest representable INT. On a machine with 32-bit signed integers using
twos-complement representation, this will be -2147483648.
$Latitude (STRING type)
The latitude of your location, expressed as a string that is a floating-point
number. Because Remind does not have a native floating-point type, we need to
express it as a string. $Latitude can range from "-90.0" to "90.0", with positive
numbers representing points north of the equator and negative numbers representing
south. Note that regardless of your locale, $Latitude is always interpreted in the
"C" locale and as such, the decimal point must be a period (".").
$Longitude (STRING type)
The longitude of your location, expressed as a string that is a floating-point
number. Because Remind does not have a native floating-point type, we need to
express it as a string. $Longitude can range from "-180.0" to "180.0", with
positive numbers representing points east of the Greenwich Meridian and negative
numbers representing west. Note that regardless of your locale, $Longitude is
always interpreted in the "C" locale and as such, the decimal point must be a
period (".").
For example, the coordinates of the Statue of Liberty in New York City are
approximately set by:
SET $Latitude "40.68933"
SET $Longitude "-74.04454"
$LatDeg, $LatMin, $LatSec (DEPRECATED)
These specify the latitude of your location. $LatDeg can range from -90 to 90, and
the others from -59 to 59. Northern latitudes are positive; southern ones are
negative. For southern latitudes, all three components should be negative. These
three variables are deprecated; you should use $Latitude instead.
$Location (STRING type)
This is a string specifying the name of your location. It is usually the name of
your town or city. It can be set to whatever you like, but good style indicates
that it should be kept consistent with the latitude and longitude system variables.
$LongDeg, $LongMin, $LongSec (DEPRECATED)
These specify the longitude of your location. $LongDeg can range from -180 to 180.
Western longitudes are positive; eastern ones are negative. Note that all three
components should have the same sign: All positive for western longitudes and all
negative for eastern longitudes. Note that for historical reasons, the sign for
longitude is different from the usual convention! If you find the longitude of
your location from a search engine, you will most likely need to invert the sign to
have it work correctly with Remind. These three variables are deprecated; you
should use $Longitude instead. Note also that $Longitude uses the standard
convention of negative for western longitudes and positive for eastern ones.
The latitude and longitude information is required for the functions sunrise() and
sunset(). Default values can be compiled into Remind, or you can SET the correct
values at the start of your reminder scripts.
Note that setting any of $LongDec, $LongMin and $LongSec updates $Longitude
correspondingly, and setting $Longitude updates $LongDeg, $LongMin and $LongSec.
Similar rules apply to $Latitude, $LatDeg, $LatMin and $LatSec.
$MaxSatIter
The maximum number of iterations for the SATISFY clause (described later.) Must be
at least 10.
$MaxStringLen
A limit on the longest string that Remind will allow you to create. The default is
65535. If you set $MaxStringLen to 0 or to -1, then remind will allow you to
create arbitrarily-long strings, at least until it runs out of memory.
$MinsFromUTC
The number of minutes between Universal Time Coordinated and local time. If
$CalcUTC is non-zero, this is calculated upon startup of Remind. Otherwise, you
must set it explicitly. If $CalcUTC is zero, then $MinsFromUTC is used in the
astronomical calculations. You must adjust it for daylight saving time yourself.
Also, if you want to initialize $MinsFromUTC using the -i command-line option, you
must also set $CalcUTC to 0 with the -i option.
$NextMode (read-only)
If non-zero, then the -n option was supplied on the command line.
$NumQueued (read-only)
Contains the number of reminders queued so far for background timed triggering.
$NumTrig (read-only)
Contains the number of reminders triggered for the current date. One use for this
variable is as follows: Suppose you wish to shade in the box of a PostScript
calendar whenever a holiday is triggered. You could save the value of $NumTrig in
a regular variable prior to executing a block of holiday reminders. If the value
of $NumTrig after the holiday block is greater than the saved value, then at least
one holiday was triggered, and you can execute the command to shade in the calendar
box. (See the section "Calendar Mode".)
Note that $NumTrig is affected only by REM commands; triggers in IFTRIG commands do
not affect it.
$PrefixLineNo (read-only)
If non-zero, then the -l option was supplied on the command line.
$PSCal (read-only)
If non-zero, then the -p option was supplied on the command line.
$RunOff (read-only)
If non-zero, the RUN directives are disabled.
$SimpleCal (read-only)
Set to a non-zero value if either of the -p or -s command-line options was
supplied.
$SortByDate (read-only)
Set to 0 if no -g option is used, 1 if sorting by date in ascending order, or 2 if
sorting by date in descending order.
$SortByPrio (read-only)
Set to 0 if no -g option is used, 1 if sorting by priority in ascending order, or 2
if sorting by priority in descending order.
$SortByTime (read-only)
Set to 0 if no -g option is used, 1 if sorting by time in ascending order, or 2 if
sorting by time in descending order.
$SubsIndent
The number of spaces by which all lines (except the first) of an MSF-type reminder
should be indented. The default is 0.
$SuppressLRM
Normally, when Remind is run with the -c option in a UTF-8 locale, it emits a left-
to-right mark sequence after printing day names or reminders. Some terminals
render this incorrectly, so you can use:
SET $SuppressLRM 1
at the top of your reminder file to suppress the LRM sequences, or you can invoke
Remind with the option '-i$SuppressLRM=1'.
$SysInclude (read-only, STRING type)
A directory path containing standard reminder scripts. Currently, Remind ships
with some standard holiday files and language packs. The value of $SysInclude is
"/usr/share/remind" on this installation.
$T (read-only, DATE type)
Exactly equivalent to trigdate(). (See BUILT-IN FUNCTIONS.)
$Td (read-only)
Equivalent to day(trigdate()).
$Tm (read-only)
Equivalent to monnum(trigdate()).
$Tw (read-only)
Equivalent to wkdaynum(trigdate()).
$Ty (read-only)
Equivalent to year(trigdate()).
$TimeSep
This variable can be set only to ":" or ".". It holds the character used to
separate portions of a time when Remind prints a TIME or DATETIME value.
$UntimedFirst (read-only)
Set to 1 if the -g option is used with a fourth sort character of "d"; set to 0
otherwise.
$U (read-only, DATE type)
Exactly equivalent to today(). (See BUILT-IN FUNCTIONS.)
$Ud (read-only)
Equivalent to day(today()).
$Um (read-only)
Equivalent to monnum(today()).
$Uw (read-only)
Equivalent to wkdaynum(today()).
$Uy (read-only)
Equivalent to year(today()).
$UseVTColors (read-only)
Set to 1 if the -@ or -cc options were used; 0 otherwise.
$UseBGVTColors (read-only)
Set to 1 if the -@,,1 option was used; 0 otherwise.
$Use256Colors (read-only)
Set to 1 if the -@1 option was used; 0 otherwise.
$UseTrueColors (read-only)
Set to 1 if the -@2 option was used; 0 otherwise.
$TerminalBackground (read-only)
Returns -1 if the terminal background color was not specified, 0 if it was
specified as dark with the -@,0 option or 1 if it was specified as light with the
-@,1 option.
Note: If any of the calendar modes are in effect, then the values of $Daemon, $DontFork,
$DontTrigAts, $DontQueue, $HushMode, $IgnoreOnce, $InfDelta, and $NextMode are not
meaningful.
BUILT-IN FUNCTIONS
Remind has a plethora of built-in functions. The syntax for a function call is the same
as in C - the function name, followed a comma-separated list of arguments in parentheses.
Function names are not case-sensitive. If a function takes no arguments, it must be
followed by "()" in the function call. Otherwise, Remind will interpret it as a variable
name, and probably not work correctly.
In the descriptions below, short forms are used to denote acceptable types for the
arguments. The characters "i", "s", "d", "t" and "q" denote INT, STRING, DATE, TIME and
DATETIME arguments, respectively. If an argument can be one of several types, the
characters are concatenated. For example, "di_arg" denotes an argument that can be a DATE
or an INT. "x_arg" denotes an argument that can be of any type. The type of the argument
is followed by an underscore and an identifier naming the argument.
The built-in functions are:
abs(i_num)
Returns the absolute value of num.
access(s_file, si_mode)
Tests the access permissions for the file file. Mode can be a string, containing a
mix of the characters "rwx" for read, write and execute permission testing.
Alternatively, mode can be a number as described in the UNIX access(2) system call.
The function returns 0 if the file can be accessed with the specified mode, and -1
otherwise.
adawn([dq_date])
Returns the time of "astronomical dawn" on the specified date. If date is omitted,
defaults to today(). If a datetime object is supplied, only the date component is
used.
adusk([dq_date])
Returns the time of "astronomical twilight" on the specified date. If date is
omitted, defaults to today().
ampm(tq_time [,s_am [,s_pm]])
Returns a STRING that is the result of converting time (which is either a TIME or a
DATETIME object) to "AM/PM" format. The optional arguments am and pm are the
strings to append in the AM and PM case, respectively; they default to "AM" and
"PM". The function obeys the system variables $DateSep, $TimeSep and $DateTimeSep
when formatting its output. For example:
ampm(0:22) returns "12:22AM"
ampm(17:45, "am", "pm") returns "5:45pm"
ampm('2020-03-14@21:34') returns "2020-03-14@9:34PM"
ansicolor(i_red, i_green, i_blue [,i_bg [,i_clamp]])
Returns a STRING that contains an ANSI escape sequence for changing the terminal
text color. The parameters red, green and blue are integers from 0 to 255
specifying the value of the respective color component. As a special case, all
three values can be -1, in which case the ANSI sequence "ESC[0m" is returned, which
resets all text attributes to normal.
The string returned by ansicolor depends on the color mode that Remind is running
in, as specified by the -@ option. If color mode is not enabled, then ansicolor
always returns the empty string. Otherwise, it returns the escape sequence that
best approximates the color according to the -@ color mode.
The optional bg argument is either 0 or 1. If 0 (the default), then the foreground
color is set. If 1, then the background color is set. Note that setting the
background color only works in 256-color or true-color mode.
The optional clamp argument is either 0 or 1. If 0 (the default), then colors are
not adjusted based on the terminal background color. If 1, then Remind attempts to
adjust dark or bright colors so they have enough contrast to be visible in the
terminal.
The first three arguments may alternatively be specified as a string consisting of
three space-separated numbers, as in this example: "128 128 0"
As a special case, ansicolor("") is equivalent to ansicolor(-1,-1,-1) and returns
the ANSI sequence to reset all text attributes to normal.
Note that inserting ANSI color sequences in calendar mode will produce garbled
results. Therefore, we recommend defining functions such as the ones below that
return the empty string in calendar mode:
IF $CalMode
FSET fg(r,g,b) ""
FSET bg(r,g,b) ""
ELSE
FSET fg(r,g,b) ansicolor(r,g,b)
FSET bg(r,g,b) ansicolor(r,g,b,1)
ENDIF
REM [fg(255,0,0)][bg(64,64,64)]Red on Gray[fg(-1,-1,-1)] in normal mode
REM SPECIAL COLOR 0 255 0 Green in normal and calendar mode
If you use the ansicolor function, don't forget to reset the color back to normal
with ansicolor(-1,-1,-1) or subsequent reminders will continue to be colored.
args(s_fname)
Returns the number of arguments expected by the user-defined function fname, or -1
if no such user-defined function exists. Note that this function examines only
user-defined functions, not built-in functions. Its main use is to determine
whether or not a particular user-defined function has been defined previously. The
args() function is available only in versions of Remind from 03.00.04 and up.
asc(s_string)
Returns an INT that is the ASCII code of the first character in string. As a
special case, asc("") returns 0. For UTF-8 strings, this will return the UTF-8
byte with which the string begins, which is not likely to be very useful (and may
indeed be negative on machines where char is a signed type.)
baseyr()
Returns the "base year" that was compiled into Remind (normally 1990.) All dates
are stored internally as the number of days since 1 January of baseyr().
char(i_i1 [,i_i2...])
This function can take any number of INT arguments. It returns a STRING consisting
of the bytes specified by the arguments. It is easy to create invalid UTF-8
sequences; char does not check for this. Note that none of the arguments can be 0,
unless there is only one argument. As a special case, char(0) returns "".
choose(i_index, x_arg1 [,x_arg2...])
Choose must take at least two arguments, the first of which is an INT. If index is
n, then the nth subsequent argument is returned. If index is less than 1, then
arg1 is returned. If index is greater than the number of subsequent arguments,
then the last argument is returned. Examples:
choose(0, "foo", 1:13, 1000) returns "foo"
choose(1, "foo", 1:13, 1000) returns "foo"
choose(2, "foo", 1:13, 1000) returns 1:13
choose(3, "foo", 1:13, 1000) returns 1000
choose(4, "foo", 1:13, 1000) returns 1000
Note that all arguments to choose() are always evaluated.
coerce(s_type, x_arg)
This function converts arg to the specified type, if such conversion is possible.
Type must be one of "INT", "STRING", "DATE", "TIME" or "DATETIME" (case-
insensitive). The conversion rules are as follows:
If arg is already of the type specified, it is returned unchanged.
If type is "STRING", then arg is converted to a string consisting of its printed
representation.
If type is "DATE", then an INT arg is converted by interpreting it as the number of
days since 1 January baseyr(). A STRING arg is converted by attempting to read it
as if it were a printed date. A DATETIME is converted to a date by dropping the
time component. A TIME arg cannot be converted to a date.
If type is "TIME", then an INT arg is converted by interpreting it as the number of
minutes since midnight. A STRING arg is converted by attempting to read it as if
it were a printed time. A DATETIME is converted to a time by dropping the date
component. A DATE arg cannot be converted to a time.
If type is "DATETIME", then an INT arg is converted by interpreting it as the
number of minutes since midnight, 1 January baseyr(). A STRING is converted by
attempting to read it as if it were a printed datetime. Other types cannot be
converted to a datetime.
If type is "INT", then DATE, TIME and DATETIME arguments are converted using the
reverse of procedures described above. A STRING arg is converted by parsing it as
an integer.
columns([s_arg])
If called with no arguments, columns() behaves as follows: If standard output is a
TTY, returns the width of the terminal in columns. If standard output is not a
TTY, attempts to open "/dev/tty" to obtain the terminal size. If this fails,
returns -1.
If called with a single string argument, columns(str) returns the number of columns
str will occupy if printed to a terminal. ANSI color-changing sequences occupy
zero columns whereas some Unicode characters occupy two columns. columns(str)
takes all of that into account. Note that if Remind was compiled without Unicode
support, columns(str) returns a type mismatch error.
current()
Returns the current date and time as a DATETIME object. This may be the actual
date and time, or may be the date and time supplied on the command line.
date(i_y, i_m, i_d)
The date() function returns a DATE object with the year, month and day components
specified by y, m and d.
datepart(dq_datetime)
Returns a DATE object representing the date portion of datetime.
datetime(args)
The datetime() function can take anywhere from two to five arguments. It always
returns a DATETIME generated from its arguments.
If you supply two arguments, the first must be a DATE and the second a TIME.
If you supply three arguments, the first must be a DATE and the second and third
must be INTs. The second and third arguments are interpreted as hours and minutes
and converted to a TIME.
If you supply four arguments, the first three must be INTs, interpreted as the
year, month and day. The fourth argument must be a TIME.
Finally, if you supply five arguments, they must all be INTs and are interpreted as
year, month, day, hour and minute.
dawn([dq_date])
Returns the time of "civil dawn" on the specified date. If date is omitted,
defaults to today(). If a datetime object is supplied, only the date component is
used.
day(dq_date)
This function takes a DATE or DATETIME as an argument, and returns an INT that is
the day-of-month component of date.
daysinmon(i_m, i_y)
Returns the number of days in month m (1-12) of the year y.
defined(s_var)
Returns 1 if the variable named by var is defined, or 0 if it is not.
Note that defined() takes a STRING argument; thus, to check if variable X is
defined, use:
defined("X")
and not:
defined(X)
The second example will attempt to evaluate X, and will return an error if it is
undefined or not of type STRING.
dosubst(s_str [,d_date [,t_time]]) or dosubst(s_str [,q_datetime])
Returns a STRING that is the result of passing str through the substitution filter
described earlier. The parameters date and time (or datetime) establish the
effective trigger date and time used by the substitution filter. If date and time
are omitted, they default to today() and now().
Note that if str does not end with "%", a newline character will be added to the
end of the result. Also, calling dosubst() with a date that is in the past (i.e.,
if date < today()) will produce undefined results.
Dosubst() is only available starting from version 03.00.04 of Remind.
dusk([dq_date])
Returns the time of "civil twilight" on the specified date. If date is omitted,
defaults to today().
easterdate(dqi_arg)
If arg is an INT, then returns the date of Easter Sunday for the specified year.
If arg is a DATE or DATETIME, then returns the date of the next Easter Sunday on or
after arg. (The time component of a datetime is ignored.)
Note that easterdate computes the Western Easter. For the Orthodox Easter date,
see orthodoxeaster.
evaltrig(s_trigger [,dq_start])
Evaluates trigger as if it were a REM or IFTRIG trigger specification and returns
the trigger date as a DATE (or as a DATETIME if there is an AT clause.) Returns a
negative INT if no trigger could be computed.
Normally, evaltrig finds a trigger date on or after today. If you supply the start
argument, then it scans starting from there.
For example, the expression:
evaltrig("Mon 1", '2008-10-07')
returns '2008-11-03', since that is the first date on or after 7 October 2008 that
satisfies "Mon 1".
If you want to see how many days it is from the first Monday in October, 2008 to
the first Monday in November, 2008, use:
evaltrig("Mon 1", '2008-11-01') - evaltrig("Mon 1", '2008-10-01')
and the answer is 28. The trigger argument to evaltrig can have all the usual
trigger clauses (OMIT, AT, SKIP, etc.) but cannot have a SATISFY, MSG, etc.
reminder-type clause.
filedate(s_filename)
Returns the modification date of filename. If filename does not exist, or its
modification date is before the year baseyr(), then 1 January of baseyr() is
returned.
filedatetime(s_filename)
Returns the modification date and time of filename. If filename does not exist, or
its modification date is before the year baseyr(), then midnight, 1 January of
baseyr() is returned.
filedir()
Returns the directory that contains the current file being processed. It may be a
relative or absolute pathname, but is guaranteed to be correct for use in an
INCLUDE command as follows:
INCLUDE [filedir()]/stuff
This includes the file "stuff" in the same directory as the current file being
processed. Note that this workaround is no longer necessary because DO stuff will
achieve the same goal.
Note that if the currently-processing reminders file was specified as a symbolic
link, then filedir() returns the directory containing the symbolic link and not the
directory containing the target of the symbolic link. You should avoid using
symbolic links to files unless both the symbolic link and its target happen to be
in the same directory.
filename()
Returns (as a STRING) the name of the current file being processed by Remind.
Inside included files, returns the name of the included file.
getenv(s_envvar)
Similar to the getenv(2) system call. Returns a string representing the value of
the specified environment variable. Returns "" if the environment variable is not
defined. Note that the names of environment variables are generally case-
sensitive; thus, getenv("HOME") is not the same as getenv("home").
hebdate(i_day, s_hebmon [,idq_yrstart [,i_jahr [,i_aflag]]])
Support for Hebrew dates - see the section "THE HEBREW CALENDAR"
hebday(dq_date)
Support for Hebrew dates - see the section "THE HEBREW CALENDAR"
hebmon(dq_date)
Support for Hebrew dates - see the section "THE HEBREW CALENDAR"
hebyear(dq_date)
Support for Hebrew dates - see the section "THE HEBREW CALENDAR"
hour(tq_time)
Returns the hour component of time.
htmlescape(s_str)
Returns a modified copy of str where "<" is replaced with "<"; ">" is replaced
with ">" and "&" is replaced with "&"
htmlstriptags(s_str)
Returns a modified copy of str where HTML tags are stripped out. The stripping
algorithm is fairly naive; the function starts stripping characters when it
encounters a "<" and it stops stripping when it encounters a ">".
iif(si_test1, x_arg1, [si_test2, x_arg2,...], x_default)
If test1 is not zero or the null string, returns arg1. Otherwise, if test2 is not
zero or the null string, returns arg2, and so on. If all of the test arguments are
false, returns default. Note that all arguments are always evaluated. This
function accepts an odd number of arguments - note that prior to version 03.00.05
of Remind, it accepted 3 arguments only. The 3-argument version of iif() is
compatible with previous versions of Remind.
index(s_search, s_target [,i_start)
Returns an INT that is the location of target in the string search. The first
character of a string is numbered 1. If target does not exist in search, then 0 is
returned.
The optional parameter start specifies the position in search at which to start
looking for target.
isany(arg1 [,arg2, ..., argN]);
Returns 1 if the first argument arg1 is equal to any of the subsequent arguments
arg2 through argN; returns 0 otherwise. Also returns 0 if called with only one
argument.
As an example, the following two expressions are equivalent:
(a == b) || (a == c) || (a == d) || (a == e)
isany(a, b, c, d, e)
isdst([d_date [,t_time]]) or isdst(q_datetime)
Returns a positive number if daylight saving time is in effect on the specified
date and time. Date defaults to today() and time defaults to midnight.
Note that this function is only as reliable as the C run-time library functions.
It is available starting with version 03.00.07 of Remind.
isleap(idq_arg)
Returns 1 if arg is a leap year, and 0 otherwise. Arg can be an INT, DATE or
DATETIME object. If a DATE or DATETIME is supplied, then the year component is
used in the test.
isomitted(dq_date)
Returns 1 if date is omitted, given the current global OMIT context. Returns 0
otherwise. (If a datetime is supplied, only the date part is used.) Note that any
local OMIT or OMITFUNC clauses are not taken into account by this function.
language()
Returns a STRING naming the language supported by Remind. (See "SUPPORT FOR OTHER
LANGUAGES") By default, Remind is compiled to support English messages, so this
function returns "English". For other languages, this function will return the
English name of the language (e.g. "German") Note that language() is not available
in versions of Remind prior to 03.00.02.
localtoutc(q_datetime)
Given a DATETIME object interpreted in the local time zone, return a DATETIME
object that expresses the same time in UTC.
lower(s_string)
Returns a STRING with all upper-case characters in string converted to lower-case.
max(x_arg1 [,x_arg2...)
Can take any number of arguments, and returns the maximum. The arguments can be of
any type, but must all be of the same type. They are compared as with the >
operator.
min(x_arg1 [,x_arg2...)
Can take any number of arguments, and returns the minimum. The arguments can be of
any type, but must all be of the same type. They are compared as with the <
operator.
minsfromutc([d_date [,t_time]]) or minsfromutc(q_datetime)
Returns the number of minutes from Universal Time Coordinated (formerly GMT) to
local time on the specified date and time. Date defaults to today() and time
defaults to midnight. If local time is before UTC, the result is negative.
Otherwise, the result is positive.
Note that this function is only as reliable as the C run-time library functions.
It is available starting with version 03.00.07 of Remind.
minute(tq_time)
Returns the minute component of time.
mon(dqi_arg)
If arg is of DATE or DATETIME type, returns a string that names the month component
of the date. If arg is an INT from 1 to 12, returns a string that names the month.
monnum(dq_date)
Returns an INT from 1 to 12, representing the month component of date.
moondate(i_phase [,d_date [,t_time]]) or moondate(i_phase, q_datetime)
This function returns the date of the first occurrence of the phase phase of the
moon on or after date and time. Phase can range from 0 to 3, with 0 signifying new
moon, 1 first quarter, 2 full moon, and 3 third quarter. If date is omitted, it
defaults to today(). If time is omitted, it defaults to midnight.
For example, the following returns the date of the next full moon:
SET fullmoon moondate(2)
moontime(i_phase [,d_date [,t_time]]) or moontime(i_phase, q_datetime)
This function returns the time of the first occurrence of the phase phase of the
moon on or after date and time. Phase can range from 0 to 3, with 0 signifying new
moon, 1 first quarter, 2 full moon, and 3 third quarter. If date is omitted, it
defaults to today(). If time is omitted, it defaults to midnight. Moontime() is
intended to be used in conjunction with moondate(). The moondate() and moontime()
functions are accurate to within a couple of minutes of the times in "Old Farmer's
Almanac" for Ottawa, Ontario.
For example, the following returns the date and time of the next full moon:
MSG Next full moon at [moontime(2)] on [moondate(2)]
moondatetime(i_phase [,d_date [,t_time]]) or moondatetime(i_phase, q_datetime)
This function is similar to moondate and moontime, but returns a DATETIME result.
moonphase([d_date [,t_time]]) or moonphase(q_datetime)
This function returns the phase of the moon on date and time, which default to
today() and midnight, respectively. The returned value is an integer from 0 to
359, representing the phase of the moon in degrees. 0 is a new moon, 180 is a full
moon, 90 is first-quarter, etc.
ndawn([dq_date])
Returns the time of "nautical dawn" on the specified date. If date is omitted,
defaults to today(). If a datetime object is supplied, only the date component is
used.
ndusk([dq_date])
Returns the time of "nautical twilight" on the specified date. If date is omitted,
defaults to today().
nonomitted(dq_start, dq_end [,s_wkday...])
This function returns the number of non-omitted days between start and end. If
start is non-omitted, then it is counted. end is never counted.
Note that end must be greater than or equal to start or an error is reported. In
addition to using the global OMIT context, you can supply additional arguments that
are names of weekdays to be omitted. However, in a REM command, any local OMITFUNC
clause is not taken into account by this function.
For example, the following line sets a to 11 (assuming no global OMITs):
set a nonomitted('2007-08-01', '2007-08-16', "Sat", "Sun")
because Thursday, 16 August 2007 is the 11th working day (not counting Saturday and
Sunday) after Wednesday, 1 August 2007.
nonomitted has various uses. For example, many schools run on a six-day cycle and
the day number is not incremented on holidays. Suppose the school year starts with
Day 1 on 4 September 2007. The following reminder will label day numbers in a
calendar:
IF today() >= '2007-09-04'
set daynum nonomitted('2007-09-04', today(), "Sat", "Sun")
REM OMIT SAT SUN SKIP CAL Day [(daynum % 6) + 1]
ENDIF
Obviously, the answer you get from nonomitted depends on the global OMIT context.
If you use moveable OMITs, you may get inconsistent results.
Here is a more complex use for nonomitted. My garbage collection follows two
interleaved 14-day cycles: One Friday, garbage and paper recycling ("Black Box")
are collected. The next Friday, garbage and plastic recycling ("Blue Box") are
collected. If any of Monday-Friday is a holiday, collection is delayed until the
Saturday. Here's a way to encode these rules:
fset _garbhol(x) wkdaynum(x) == 5 && nonomitted(x-4, x+1) < 5
REM 12 November 1999 *14 AFTER OMITFUNC _garbhol MSG Black Box
REM 19 November 1999 *14 AFTER OMITFUNC _garbhol MSG Blue Box
Here's how it works: The _garbhol(x) user-defined function returns 1 if and only
if (1) x is a Friday and (2) there is at least one OMITted day from the previous
Monday up to and including the Friday.
The first REM statement sets up the 14-day black-box cycle. The AFTER keyword
makes it move collection to the Saturday if _garbhol returns 1. The second REM
statement sets up the 14-day blue-box cycle with a similar adjustment made by AFTER
in conjunction with _garbhol.
now() Returns the current system time, as a TIME type. This may be the actual time, or a
time supplied on the command line.
ord(i_num)
Returns a string that is the ordinal number num. For example, ord(2) returns
"2nd", and ord(213) returns "213th".
orthodoxeaster(dqi_arg)
If arg is an INT, then returns the date of Orthodox Easter Sunday for the specified
year. If arg is a DATE or DATETIME, then returns the date of the next Orthodox
Easter Sunday on or after arg. (The time component of a datetime is ignored.)
Note that orthodoxeaster computes the Orthodox Easter. For the Western Easter
date, see easterdate.
ostype()
Returns "UNIX". Remind used to run on OS/2 and MS-DOS, but does not any longer.
pad(x_arg, s_padstr, i_len [, i_right])
Converts the first argument arg to a string if necessary, and then if it is shorter
than len characters, pads to to len characters using as many copies (including
partial copies) of padstr as necessary. By default, the string is left-padded, but
if right is supplied and non-zero, the string will be right-padded.
Here are some examples:
pad(3, "0", 2) --> "03"
pad(465, "0", 2) --> "465"
pad("foo", " ", 5) --> " foo"
pad("foo", " ", 5, 1) --> "foo "
pad("foo", "bar", 11) --> "barbarbafoo"
plural(i_num [,s_str1 [,s_str2]])
Can take from one to three arguments. If one argument is supplied, returns "s" if
num is not 1, and "" if num is 1.
If two arguments are supplied, returns str1 + "s" if num is not 1. Otherwise,
returns str1.
If three arguments are supplied, returns str1 if num is 1, and str2 otherwise.
psmoon(i_phase [,i_size [,s_note [,i_notesize]]])
[DEPRECATED] Returns a STRING consisting of PostScript code to draw a moon in the
upper-left hand corner of the calendar box. Phase specifies the phase of the moon,
and is 0 (new moon), 1 (first quarter), 2 (full moon) or 3 (third quarter). If
size is specified, it controls the radius of the moon in PostScript units (1/72
inch.) If it is not specified or is negative, the size of the day-number font is
used.
For example, the following four lines place moon symbols on the PostScript
calendar:
REM [moondate(0)] PS [psmoon(0)]
REM [moondate(1)] PS [psmoon(1)]
REM [moondate(2)] PS [psmoon(2)]
REM [moondate(3)] PS [psmoon(3)]
If note is specified, the text is used to annotate the moon display. The font is
the same font used for calendar entries. If notesize is given, it specifies the
font size to use for the annotation, in PostScript units (1/72 inch.) If notesize
is not given, it defaults to the size used for calendar entries. (If you annotate
the display, be careful not to overwrite the day number -- Remind does not check
for this.) For example, if you want the time of each new moon displayed, you could
use this in your reminder script:
REM [moondate(0)] PS [psmoon(0, -1, moontime(0)+"")]
Note how the time is coerced to a string by concatenating the null string.
psshade(i_gray) or psshade(i_red, i_green, i_blue)
[DEPRECATED] Returns a STRING that consists of PostScript commands to shade a
calendar box. Num can range from 0 (completely black) to 100 (completely white.)
If three arguments are given, they specify red, green and blue intensity from 0 to
100. Here's an example of how to use this:
REM Sat Sun PS [psshade(95)]
The above command emits PostScript code to lightly shade the boxes for Saturday and
Sunday in a PostScript calendar.
Note that psmoon and psshade are deprecated; instead you should use the SPECIAL
SHADE and SPECIAL MOON reminders as described in "Out-of-Band Reminders."
realcurrent()
Returns (as a DATETIME) the true date and time of day as provided by the operating
system. This is in contrast to current(), which may return a time supplied on the
command line.
realnow()
Returns the true time of day as provided by the operating system. This is in
contrast to now(), which may return a time supplied on the command line.
realtoday()
Returns the date as provided by the operating system. This is in contrast to
Remind's concept of "today", which may be changed if it is running in calendar
mode, or if a date has been supplied on the command line.
rows() If standard output is a TTY, returns the height of the terminal in rows. If
standard output is not a TTY, attempts to open "/dev/tty" to obtain the terminal
size. If this fails, returns -1.
sgn(i_num)
Returns -1 if num is negative, 1 if num is positive, and 0 if num is zero.
shell(s_cmd [,i_maxlen])
Executes cmd as a system command, and returns the first 511 characters of output
resulting from cmd. Any whitespace character in the output is converted to a
space. Note that if RUN OFF has been executed, or the -r command-line option has
been used, shell() will result in an error, and cmd will not be executed.
If maxlen is specified, then shell() returns the first maxlen characters of output
(rather than the first 511). If maxlen is specified as a negative number, then it
defaults to the value of the system variable $MaxStringLen.
shellescape(s_str)
Returns str with all shell metacharacters such as " ", "*", etc escaped with a
backslash. For example:
SET a shellescape("a b*? c&d$e")
will set a to:
"a\ b\*\?\ c\&d\$e"
slide(d_start, i_amt [,s_wkday...])
This function is the inverse of nonomitted. It adds amt days (which can be
negative) to start, not counting omitted days. The optional wkday arguments are
additional weekday names to omit.
Consider this example:
OMIT 14 May 2009
SET a slide('2009-05-13', 5, "Sat", "Sun")
In this case, a is set to 2009-05-21. That's because we slide forward by 5 days,
not including Thursday, May 14 or Saturday and Sunday, May 16 and 17. You can go
backwards, too, so:
OMIT 14 May 2009
SET a slide('2009-05-21', -5, "Sat", "Sun")
takes a back to 2009-05-13.
soleq(i_which [, dqi_start])
The soleq function computes solstices and equinoxes. The which parameter ranges
from 0 to 3, and specifies which event we are interested in: 0 is the March
equinox; 1 is the June solstice; 2 is the September equinox and 3 is the December
solstice.
The optional start parameter can either be an integer specifying the year of the
event we are interested in, or a DATE or DATETIME object; if the latter, then soleq
returns the first event on or after the date part of the start parameter (it
ignores the time component if start is a DATETIME.) If start is not supplied, then
it defaults to today().
The return value of soleq() is a DATETIME object specifying the date and time of
the solstice or equinox in the local time zone. It should be accurate to within 3
minues or so in the worst case.
See the included file $SysInclude/seasons.rem for examples of how to use soleq().
stdout()
Returns a string representing where Remind's standard output is going. The return
values are one of the following: "TTY" if standard-output is a terminal, "BLOCKDEV"
if it is a block device (very unlikely), "CHARDEV" if it is a character device (eg,
/dev/null), "DIR" if it is a directory (very unlikely), "PIPE" if it is a pipe or
FIFO, "SYMLINK" if it is a symlink (very unlikely), "SOCKET" if it is a socket, or
"UNKNOWN" if it could not be determined.
The purpose of stdout() is mostly to distinguish between TTY and non-TTY output;
you may wish to change or disable colors if the output is not going to a TTY.
strlen(s_str)
Returns the length of str. If the length of str is too large to represent as an
integer, emits a "Number too high" error.
substr(s_str, i_start [,i_end])
Returns a STRING consisting of all characters in str from start up to and including
end. Characters are numbered from 1. If end is not supplied, then it defaults to
the length of str.
sunrise([dq_date])
Returns a TIME indicating the time of sunrise on the specified date (default
today().) In high latitudes, there may be no sunrise on a particular day, in which
case sunrise() returns the INT 0 if the sun never sets, or 1440 if it never rises.
sunset([dq_date])
Returns a TIME indicating the time of sunset on the specified date (default
today().) In high latitudes, there may be no sunset on a particular day, in which
case sunset() returns the INT 0 if the sun never rises, or 1440 if it never sets.
The functions sunrise() and sunset() are based on an algorithm in "Almanac for
Computers for the year 1978" by L. E. Doggett, Nautical Almanac Office, USNO. They
require the latitude and longitude to be specified by setting the appropriate
system variables. (See "System Variables".) The sun functions should be accurate
to within about 4 minutes for latitudes lower than 60 degrees. The functions are
available starting from version 03.00.07 of Remind.
time(i_hr, i_min)
Creates a TIME with the hour and minute components specified by hr and min.
timepart(tq_datetime)
Returns a TIME object representing the time portion of datetime.
timezone([dq_datetime])
Returns a string representing the local time zone name of the given DATETIME. If
no argument is supplied, Remind uses the value of current(). If a DATE rather than
DATETIME is supplied, Remind uses a time part of 00:00.
today()
Returns Remind's notion of "today." This may be the actual system date, or a date
supplied on the command line, or the date of the calendar entry currently being
computed.
trig(s_1 [,s_2, ...])
For each string argument s_n, trig evaluates s_n as if it were a REM or IFTRIG
trigger specification. If the trigger would trigger today, then the trigger date
is returned and no further triggers are evaluated. If none of the triggers would
trigger today, then the zero date 1990-01-01 is returned.
trig also has a zero-argument form; this returns the trigger date of the most
recent trig function that returned a non-zero trigger date.
trig can be used to make more sophisticated versions of IFTRIG. For example, if
you have meetings every Monday in June and July, and you want warnings 3 days in
advance, you could use:
REM [trig("Mon Jun +3", "Mon July +3")] +3 MSG Meeting %b
NOTE: We need to repeat the +3 delta outside of the trig function for advance
warning to work properly. This is because trig returns a date constant (the
trigger date) and the REM command does not know the details of trig's arguments.
Note that because Remind does not have short-circuit logical operators, something
like:
SET a trig("Mon +7") || trig("Fri +7")
would set the value of trig() to the date of the following Thursday. Even though
trig("Mon +7") always returns true, the logical-OR operator still evaluates
trig("Fri +7") which also returns true and sets trig().
You can work around the lack of a short-circuit logical-OR as follows: If trig
returns a true value, the specific value it returns can be coerced to a DATE which
is the trigger date. So the following code:
SET a trig("Mon +4") || trig("Fri +4")
IF a
REM [a] +4 MSG [wkday($T)] %b.
ENDIF
would operate as follows:
On Monday: Monday today.
On Tuesday: Friday in 3 days' time.
On Wednesday: Friday in 2 days' time.
On Thursday: Monday in 4 days' time.
On Friday: Monday in 3 days' time.
On Saturday: Monday in 2 days' time.
On Sunday: Monday tomorrow.
Compare with the following:
SET a trig("Mon +4") || trig("Fri +4")
IF a
REM [trig()] +4 MSG [wkday($T)] %b.
ENDIF
which yields:
On Monday: Friday in 4 days' time.
On Tuesday: Friday in 3 days' time.
On Wednesday: Friday in 2 days' time.
On Thursday: Friday tomorrow.
On Friday: Friday today.
On Saturday: Monday in 2 days' time.
On Sunday: Monday tomorrow.
That is because trig() returns the trigger date of the last trig function that
returns true, whereas the value of a is the trigger date of the first trig function
that returns true.
Important Note: Because trig() always returns an absolute date, it will not work
properly with a SATISFY clause. Consider this reminder:
REM [trig("Mar", "Apr")] SATISFY [$Td == 15] MSG 15 Mar or April
If we run Remind on 5 March 2022, we might expect the trigger date to be calculated
as 15 March 2022... but that's not what happens. Instead, the trig function is
evaluated first, and it returns 2022-03-05. So as far as Remind is concerned, the
REM statement becomes:
REM 2022-03-05 SATISFY [$Td == 15] MSG 15 Mar or April
and the SATISFY expression is never true. So: Do not mix trig() and SATISFY.
trigdate()
Returns the calculated trigger date of the last REM or IFTRIG command. If used in
the body of a REM command, returns that command's trigger date. If the most recent
REM command did not yield a computable trigger date, returns the integer 0.
trigdatetime()
Similar to trigdate(), but returns a DATETIME if the most recent triggerable REM
command had an AT clause. If there was no AT clause, returns a DATE. If no
trigger could be computed, returns the integer 0. See "MULTI-DAY EVENTS" for more
information.
trigeventstart()
Returns a DATETIME representing the start of the most recent triggerable REM
command that had an AT clause. For events without a DURATION or that do not span
multiple days, returns the same as trigdatetime(). If the REM command did not have
an AT clause, returns the integer -1 (and differs from trigdatetime() in this
respect.) See "MULTI-DAY EVENTS" for more information.
trigeventduration()
Returns a TIME representing the duration of the most recent triggerable REM command
that had an AT and a DURATION clause. If the event does not span multiple days,
returns the same thing as trigduration(). If the REM command lacked an AT or
DURATION clause, returns -1. See "MULTI-DAY EVENTS" for more information.
trigback()
Returns the "back" amount of the last REM or IFTRIG command. Returns a positive
integer N if the "back" is of the form -N, or a negative integer if it is of the
form --N. If there is no "back", then returns 0.
trigdelta()
Returns the "delta" amount of the last REM or IFTRIG command. Returns a positive
integer N if the "delta" is of the form +N, or a negative integer if it is of the
form ++N. If there is no "delta", then returns 0.
trigtimedelta()
Similar to trigdelta(), but returns the delta used in the AT clause of a timed
reminder.
trigrep()
Returns the "repeat" amount of the last REM or IFTRIG command. Returns a positive
integer N if the "repeat" is of the form *N. If there is no "repeat", then returns
0.
trigtimerep()
Similar to trigrep(), but returns the repeat used in the AT clause of a timed
reminder.
trigduration()
Returns (as a TIME type) the DURATION parameter of a timed reminder. If there is
no DURATION parameter, returns the integer -1. See "MULTI-DAY EVENTS" for more
information.
trigpriority()
Returns the PRIORITY of the last REM or IFTRIG command.
triguntil()
Returns (as a DATE type) the UNTIL parameter of the last REM or IFTRIG command. If
there was no UNTIL parameter, returns the integer -1. If there is a THROUGH
parameter, that will be returned by triguntil() since "THROUGH yyyy-mm-dd" is
simply syntactic sugar for "*1 UNTIL yyyy-mm-dd".
trigscanfrom()
Returns (as a DATE type) the SCANFROM parameter of the last REM or IFTRIG command.
If there was no SCANFROM parameter, returns the integer -1. Note that FROM and
SCANFROM interact; a reminder that has a "FROM yyyy-mm-dd" parameter will act as if
it has a SCANFROM parameter whose value is the maximum of "yyyy-mm-dd" and today.
trigfrom()
Returns (as a DATE type) the FROM parameter of the last REM or IFTRIG command. If
there was no FROM parameter, returns the integer -1.
trigger(d_date [,t_time [,i_utcflag]]) or trigger(q_datetime [,i_utcflag])
Returns a string suitable for use in a REM command or a SCANFROM or UNTIL clause,
allowing you to calculate trigger dates in advance. Note that in earlier versions
of Remind, trigger was required to convert a date into something the REM command
could consume. However, in this version of Remind, you can omit it. Note that
trigger() always returns its result in English, even for non-English versions of
Remind. Normally, the date and time are the local date and time; however, if
utcflag is non-zero, the date and time are interpreted as UTC times, and are
converted to local time. Examples:
trigger('1993/04/01')
returns "1 April 1993",
trigger('1994/08/09', 12:33)
returns "9 August 1994 AT 12:33", as does:
trigger('1994/08/09@12:33').
Finally:
trigger('1994/12/01', 03:00, 1)
returns "30 November 1994 AT 22:00" for EST, which is 5 hours behind UTC. The
value for your time zone may differ.
trigtags()
Returns a comma-separated list of the TAGs associated with the most recent REM
command that was triggered. Returns the empty string if there were no TAGs. If
there are multiple tags, they are each separated by a single comma, not a comma and
a space.
trigtime()
Returns the time of the last REM command with an AT clause. If the last REM did
not have an AT clause, returns the integer 0. If a REM command has an AT clause
with a DURATION, then you can compute the end time as trigtime() + trigduration().
trigvalid()
Returns 1 if the value returned by trigdate() is valid for the most recent REM
command, or 0 otherwise. Sometimes REM commands cannot calculate a trigger date.
For example, the following REM command can never be triggered:
REM Mon OMIT Mon SKIP MSG Impossible!
typeof(x_arg)
Returns "STRING", "INT", "DATE", "TIME" or "DATETIME", depending on the type of
arg.
tzconvert(q_datetime, s_srczone [,s_dstzone])
Converts datetime from the time zone named by srczone to the time zone named by
dstzone. If dstzone is omitted, the default system time zone is used. The return
value is a DATETIME. Time zone names are system-dependent; consult your operating
system for legal values. Here is an example:
tzconvert('2007-07-08@01:14', "Canada/Eastern", "Canada/Pacific")
returns
2007-07-07@22:14
upper(s_string)
Returns a STRING with all lower-case characters in string converted to upper-case.
utctolocal(q_datetime)
Given a DATETIME object interpreted in UTC, return a DATETIME object that expresses
the same time in the local time zone.
value(s_varname [,x_default])
Returns the value of the specified variable. For example, value("X"+"Y") returns
the value of variable XY, if it is defined. If XY is not defined, an error
results.
However, if you supply a second argument, it is returned if the varname is not
defined. The expression value("XY", 0) will return 0 if XY is not defined, and the
value of XY if it is defined.
version()
Returns a string specifying the version of Remind. For version 04.02.05, returns
"04.02.05". It is guaranteed that as new versions of Remind are released, the
value returned by version() will strictly increase, according to the rules for
string ordering.
weekno([dq_date, [i_wkstart, [i_daystart]]])
Returns the week number of the year. If no arguments are supplied, returns the ISO
8601 week number for today(). If one argument date is supplied, then returns the
ISO 8601 week number for that date. If two arguments are supplied, then wkstart
must range from 0 to 6, and represents the first day of the week (with 0 being
Sunday and 6 being Saturday.). If wkstart is not supplied, then it defaults to 1.
If the third argument daystart is supplied, then it specifies when Week 1 starts.
If daystart is less than or equal to 7, then Week 1 starts on the first wkstart on
or after January daystart. Otherwise, Week 1 starts on the first wkstart on or
after December daystart. If omitted, daystart defaults to 29 (following the ISO
8601 definition.)
wkday(dqi_arg)
If arg is a DATE or DATETIME, returns a string representing the day of the week of
the date. If arg is an INT from 0 to 6, returns the corresponding weekday
("Sunday" to "Saturday").
wkdaynum(dq_date)
Returns a number from 0 to 6 representing the day-of-week of the specified date.
(0 represents Sunday, and 6 represents Saturday.)
year(dq_date)
Returns a INT that is the year component of date.
MULTI-DAY EVENTS
If you specify a start time with AT and a duration with DURATION, you can create events
that span multiple days. Consider these two REM statements:
REM 1991-02-13 AT 16:00 DURATION 72:00 MSG 72-hour event
REM 1991-02-13 THROUGH 1991-02-16 AT 16:00 MSG Four events
The first statement creates a single event that starts on 13 February 1991 at 16:00 and
runs through 16 February 1991 at 16:00
The second statements creates four separate events that start at 16:00 on 13, 14, 15 and
16 February 1991 and have indefinite duration.
Remind handles multi-day events specially. These are the rules:
On the first day of a multi-day event, trigdatetime() will return the starting date and
time of the event, and trigduration() will return the original DURATION.
On each subsequent day of a multi-day event, trigdatetime() will return midnight on the
day in question, and trigduration() will return the remaining duration. Consider this
example:
#!/bin/sh
remind - 12 feb 1991 '*6' <<'EOF'
BANNER %
REM 1991-02-13 AT 16:00 DURATION 72:00 SATISFY 1
set a trigdatetime()
set b trigduration()
set c trigeventstart()
set d trigeventduration()
MSG now=[today()] dt=[a] dur=[b] estart=[c] edur=[d]%
EOF
The output is:
now=1991-02-12 dt=1991-02-13@16:00 dur=72:00 estart=1991-02-13@16:00 edur=72:00
now=1991-02-13 dt=1991-02-13@16:00 dur=72:00 estart=1991-02-13@16:00 edur=72:00
now=1991-02-14 dt=1991-02-14@00:00 dur=64:00 estart=1991-02-13@16:00 edur=72:00
now=1991-02-15 dt=1991-02-15@00:00 dur=40:00 estart=1991-02-13@16:00 edur=72:00
now=1991-02-16 dt=1991-02-16@00:00 dur=16:00 estart=1991-02-13@16:00 edur=72:00
now=1991-02-17 dt=1991-02-13@16:00 dur=72:00 estart=-1 edur=-1
As you see, the trigdatetime() and trigduration() functions return the start time and
duration of the remaining portion of a multi-day event, whereas trigeventstart and
trigeventduration always return the original start and duration of the multi-day event.
Note also that the return value for expired reminders is not reliable; the fact that
trigeventstart and trigeventduration return -1 in that case is an implementation artifact.
SELF-OVERLAPPING EVENTS
A multi-day event has the possibility of "overlapping itself". When this happens, Remind
prefers the later event (only one copy of an event is ever triggered for a given date.)
Consider this example:
#!/bin/sh
remind - '*5' 10 Feb 1991 <<'EOF'
BANNER %
REM MON at 0:00 DURATION 192:0 MSG [today()] [trigeventstart()] [trigduration()]%
EOF
The output is:
1991-02-10 1991-02-04@00:00 48:00
1991-02-11 1991-02-11@00:00 192:00
1991-02-12 1991-02-11@00:00 168:00
1991-02-13 1991-02-11@00:00 144:00
1991-02-14 1991-02-11@00:00 120:00
Although the event from 1991-02-04 still has 24 hours left on 1991-02-11, the fresh
occurrence on 1991-02-11 takes precedences and is the one that is triggered.
I do not recommend constructing self-overlapping multi-day events.
EXPRESSION PASTING
An extremely powerful feature of Remind is its macro capability, or "expression pasting."
In almost any situation where Remind is not expecting an expression, you can "paste" an
expression in. To do this, surround the expression with square brackets. For example:
REM [mydate] MSG foo
This evaluates the expression "mydate", where "mydate" is presumably some pre-computed
variable, and then "pastes" the result into the command-line for the parser to process.
A formal description of this is: When Remind encounters a "pasted-in" expression, it
evaluates the expression, and coerces the result to a STRING. It then substitutes the
string for the pasted-in expression, and continues parsing. Note, however, that
expressions are evaluated only once, not recursively. Thus, writing:
["[a+b]"]
causes Remind to read the token "[a+b]". It does not interpret this as a pasted-in
expression. In fact, the only way to get a literal left-bracket into a reminder is to use
["["].
You can use expression pasting almost anywhere. However, there are a few exceptions:
o If Remind is expecting an expression, as in the SET command, or the IF command, you
should not include square brackets. For example, use:
SET a 4+5
and not:
SET a [4+5]
o You cannot use expression pasting for the first token on a line. For example, the
following will not work:
["SET"] a 1
This restriction is because Remind must be able to unambiguously determine the
first token of a line for the flow-control commands (to be discussed later.)
In fact, if Remind cannot determine the first token on a line, it assumes that it
is a REM command. If expression-pasting is used, Remind assumes it is a REM
command. Thus, the following three commands are equivalent:
REM 12 Nov 1993 AT 13:05 MSG BOO!
12 Nov 1993 AT 13:05 MSG BOO!
[12] ["Nov " + 1993] AT [12:05+60] MSG BOO!
o You cannot use expression-pasting to determine the type (MSG, CAL, etc.) of a REM
command. You can paste expressions before and after the MSG, etc. keywords, but
cannot do something like this:
REM ["12 Nov 1993 AT 13:05 " + "MSG" + " BOO!"]
However, as an escape hatch, the sequence SPECIAL type means the same thing as just
type where type is one of MSG, MSF, RUN, CAL, PS and PSFILE. This lets you do
something like this:
SET type "MSG"
REM 12 Nov 2024 SPECIAL [type] Hello
You can use this to control the types of your reminders based on variables you set,
how Remind is invoked, etc.
COMMON PITFALLS WITH EXPRESSION PASTING
Remember that extra spaces are not inserted when an expression is pasted. Thus, something
like:
REM[expr]MSG[expr]
will probably fail.
If you use an expression to calculate a delta or back, ensure that the result is a
positive number. Something like:
REM +[mydelta] Nov 12 1993 MSG foo
will fail if mydelta happens to be negative.
FLOW CONTROL COMMANDS
Remind has commands that control the flow of a reminder script. Normally, reminder
scripts are processed sequentially. However, IF and related commands allow you to process
files conditionally, and skip sections that you don't want interpreted.
THE IF COMMAND
The IF command has the following form:
IF expr
t-command
t-command...
ELSE
f-command
f-command...
ENDIF
Note that the commands are shown indented for clarity. Also, the ELSE portion can be
omitted. IF commands can be nested up to a small limit, probably around 8 or 16 levels of
nesting, depending on your system.
If the expr evaluates to a non-zero INT, a DATE that is not 1990-01-01, a TIME that is not
00:00, a DATETIME that is not 1990-01-01@00:00, or a non-null STRING, then the IF portion
is considered true, and the t-commands are executed. If expr evaluates to zero or null,
then the f-commands (if the ELSE portion is present) are executed.
Examples:
IF defined("want_hols")
INCLUDE /usr/share/remind/holidays
ENDIF
IF today() > '1992/2/10'
set missed_ap "You missed it!"
ELSE
set missed_ap "Still have time..."
ENDIF
THE IFTRIG COMMAND
The IFTRIG command is similar to an IF command, except that it computes a trigger (as in
the REM command), and evaluates to true if a corresponding REM command would trigger.
Examples:
IFTRIG 1 Nov
; Executed on 1 Nov
ELSE
; Executed except on 1 Nov
ENDIF
IFTRIG 1 -1 OMIT Sat Sun +4
; Executed on last working day of month,
; and the 4 working days preceding it
ELSE
; Executed except on above days
ENDIF
Note that the IFTRIG command computes a trigger date, which can be retrieved with the
trigdate() function. You can use all of the normal trigger components, such as UNTIL,
delta, etc. in the IFTRIG command. However, you cannot use a type specifier such as CAL,
MSG or SATISFY; attempting to do so yields a parse error.
USER-DEFINED FUNCTIONS
In addition to the built-in functions, Remind allows you to define your own functions.
The FSET command does this for you:
FSET fname(args) expr
Fname is the name of the function, and follows the convention for naming variables. Args
is a comma-separated list of arguments, and expr is an expression. Args can be empty, in
which case you define a function taking no parameters. Here are some examples:
FSET double(x) 2*x
FSET yeardiff(date1, date2) year(date1) - year(date2)
FSET since(x) ord(year(trigdate())-x)
The last function is useful in birthday reminders. For example:
REM 1 Nov +12 MSG Dean's [since(1984)] birthday is %b.
Dean was born in 1984. The above example, on 1 November 1992, would print:
Dean's 8th birthday is today.
Notes:
o If you access a variable in expr that is not in the list of arguments, the global
value (if any) is used.
o Function and parameter names are significant to 64 characters.
o The value() function always accesses the global value of a variable, even if it has
the same name as an argument. For example:
fset func(x) value("x")
set x 1
set y func(5)
The above sequence sets y to 1, which is the global value of x.
o User-defined functions may call other functions, including other user-defined
functions. However, recursive calls are not allowed.
o User-defined functions are not syntax-checked when they are defined; parsing occurs
only when they are called.
o If a user-defined function has the same name as a built-in function, it is ignored
and the built-in function is used. To prevent conflicts with future versions of
Remind (which may define more built-in functions), you may wish to name all user-
defined functions beginning with an underscore.
To delete a user-defined function, use FUNSET. This takes a space-separated list of user-
defined functions to delete. For example, after the command:
FUNSET myfunc1 otherfunc thirdfunc
it is guaranteed that no user-defined functions named myfunc1, otherfunc or thirdfunc will
exist. Remind does not issue an error if you try to FUNSET a nonexistent user-defined
function; it simply does nothing in that case.
PRECISE SCHEDULING
The WARN keyword allows precise control over advance warning in a more flexible manner
than the delta mechanism. It should be followed by the name of a user-defined function,
warn_function.
If a warn_function is supplied, then it must take one argument of type INT. Remind
ignores any delta, and instead calls warn_function successively with the arguments 1, 2,
3, ...
Warn_function's return value n is interpreted as follows:
o If n is positive, then the reminder is triggered exactly n days before its trigger
date.
o If n is negative, then it is triggered n days before its trigger date, not counting
OMITted days.
As an example, suppose you wish to be warned of American Independence Day 5, 3, and 1 days
in advance. You could use this:
FSET _wfun(x) choose(x, 5, 3, 1, 0)
REM 4 July WARN _wfun MSG American Independence Day is %b.
NOTES
1 If an error occurs during the evaluation of warn_function, then Remind stops
calling it and simply issues the reminder on its trigger date.
2 If the absolute-values of the return values of warn_function are not monotonically
decreasing, Remind stops calling it and issues the reminder on its trigger date.
3 Warn_function should (as a matter of good style) return 0 as the final value in its
sequence of return values. However, a reminder will always be triggered on its
trigger date, regardless of what warn_function does.
Similarly to WARN, the SCHED keyword allows precise control over the scheduling of timed
reminders. It should be followed by the name of a user-defined function, sched_function.
If a scheduling function is supplied, then it must take one argument of type INT. Rather
than using the AT time, time delta, and time repeat, Remind calls the scheduling function
to determine when to trigger the reminder. The first time the reminder is queued, the
scheduling function is called with an argument of 1. Each time the reminder is triggered,
it is re-scheduled by calling the scheduling function again. On each call, the argument
is incremented by one.
The return value of the scheduling function must be an INT or a TIME. If the return value
is a TIME, then the reminder is re-queued to trigger at that time. If it is a positive
integer n, then the reminder is re-queued to trigger at the previous trigger time plus n
minutes. Finally, if it is a negative integer or zero, then the reminder is re-queued to
trigger n minutes before the AT time. Note that there must be an AT clause for the SCHED
clause to do anything.
Here's an example:
FSET _sfun(x) choose(x, -60, 30, 15, 10, 3, 1, 1, 1, 1, 0)
REM AT 13:00 SCHED _sfun MSG foo
The reminder would first be triggered at 13:00-60 minutes, or at 12:00. It would next be
triggered 30 minutes later, at 12:30. Then, it would be triggered at 12:45, 12:55, 12:58,
12:59, 13:00, 13:01 and 13:02.
NOTES
1 If an error occurs during the evaluation of sched_func, then Remind reverts to
using the AT time and the delta and repeat values, and never calls sched_func
again.
2 If processing sched_func yields a time earlier than the current system time, it is
repeatedly called with increasing argument until it yields a value greater than or
equal to the current time. However, if the sequence of values calculated during
the repetition is not strictly increasing, then Remind reverts to the default
behaviour and never calls sched_func again.
3 It is quite possible using sched_func to keep triggering a reminder even after the
AT-time. However, it is not possible to reschedule a reminder past midnight - no
crossing of date boundaries is allowed. Also, it is quite possible to not trigger
a reminder on the AT time when you use a scheduling function. However, if your
scheduling function is terminated (for reasons 1 and 2) before the AT time of the
reminder, it will be triggered at the AT time, because normal processing takes
over.
4 Your scheduling functions should (as a matter of good style) return 0 when no more
scheduling is required. See the example.
5 All scheduling functions are evaluated after the entire Remind script has been read
in. So whatever function definitions are in effect at the end of the script are
used.
THE SATISFY CLAUSE
The form of REM that uses SATISFY is as follows:
REM trigger SATISFY expr
The way this works is as follows: Remind first calculates a trigger date, in the normal
fashion. Next, it sets trigdate() to the calculated trigger date. It then evaluates
expr. If the result is not the null string or zero, processing ends. Otherwise, Remind
computes the next trigger date, and re-tests expr. This iteration continues until expr
evaluates to non-zero or non-null, or until the iteration limit specified with the -x
command-line option is reached.
If expr is not satisfied, then trigvalid() is set to 0 and the error message "Can't
compute trigger" is issued. Otherwise, trigvalid() is set to 1.
This is really useful only if expr involves a call to the trigdate() or related functions;
otherwise, expr will not change as Remind iterates.
An example of the usefulness of SATISFY: Suppose you wish to be warned of every Friday
the 13th. Your first attempt may be:
# WRONG!
REM Fri 13 +2 MSG Friday the 13th is %b.
But this won't work. This reminder triggers on the first Friday on or after the 13th of
each month. The way to do it is with a more complicated sequence:
REM 13 SATISFY wkdaynum(trigdate()) == 5
IF trigvalid()
REM [trigdate()] +2 MSG \
Friday the 13th is %b.
ENDIF
You can write the REM statement a little more concisely:
REM 13 SATISFY $Tw == 5
Let's see how this works. The SATISFY clause iterates through all the 13ths of successive
months, until a trigger date is found whose day-of-week is Friday (== 5). If a valid date
was found, we use the calculated trigger date to set up the next reminder.
We could also have written:
REM Fri SATISFY day(trigdate()) == 13
but this would result in more iterations, since "Fridays" occur more often than "13ths of
the month."
Here is another example: Suppose you want to be reminded of something on the 15th of
January, April, July, and October. You could make four separate reminders, or you could
use:
REM 15 SATISFY [isany($Tm, 1, 4, 7, 10)] MSG 15th Reminder!
This technique of using one REM command to calculate a trigger date to be used by another
command is quite powerful. For example, suppose you wanted to OMIT Labour day, which is
the first Monday in September. You could use:
# Note: SATISFY 1 is an idiom for "do nothing"
REM Mon 1 Sept SATISFY 1
OMIT [trigdate()]
CAVEAT: This only omits the next Labour Day, not all Labour Days in the future. This
could cause strange results, as the OMIT context can change depending on the current date.
For example, if you use the following command after the above commands:
REM Mon AFTER msg hello
the result will not be as you expect. Consider producing a calendar for September, 1992.
Labour Day was on Monday, 7 September, 1992. However, when Remind gets around to
calculating the trigger for Tuesday, 8 September, 1992, the OMIT command will now be
omitting Labour Day for 1993, and the "Mon AFTER" command will not be triggered. (But see
the description of SCANFROM in the section "DETAILS ABOUT TRIGGER COMPUTATION.")
It is probably best to stay away from computing OMIT trigger dates unless you keep these
pitfalls in mind.
For versions of Remind starting from 03.00.07, you can include a MSG, RUN, etc. clause in
a SATISFY clause as follows:
REM trigger_stuff SATISFY [expr] MSG body
Note that for this case only, the expr after SATISFY must be enclosed in square brackets.
It must come after all the other components of the trigger, and immediately before the
MSG, RUN, etc. keyword. If expr cannot be satisfied, then the reminder is not triggered.
Thus, the "Friday the 13th" example can be expressed more compactly as:
REM 13 +2 SATISFY [$Tw == 5] MSG Friday the 13th is %b.
And you can trigger a reminder on Mondays, Wednesdays and Thursdays occurring on odd-
numbered days of the month with the following:
REM Mon Wed Thu SATISFY [$Td %2 ] MSG Here it is!!!
Note that SATISFY and OMITFUNC can often be used to solve the same problem, though in
different ways. Sometimes a SATISFY is cleaner and sometimes an OMITFUNC; experiment and
use whichever seems clearer.
POSSIBLY-UNCOMPUTABLE TRIGGERS
Occasionally, you may wish to suppress the "Can't compute trigger" warnings for reminders
for which a trigger date cannot be computed. For example, the following reminder is
triggered on a Monday that is not a holiday if the following Tuesday is a holiday:
REM Mon SKIP SATISFY [isomitted($T+1)] MSG Work between holidays
However, if there are no Mondays after today's date that satisfy the condition, Remind
will print the "Can't compute trigger" error. To suppress this, use the MAYBE-
UNCOMPUTABLE keyword:
REM MAYBE-UNCOMPUTABLE Mon SKIP SATISFY [isomitted($T+1)] MSG Work between holidays
It's almost never appropriate to use MAYBE-UNCOMPUTABLE, but it is provided for those rare
occasions when it makes sense. If you use MAYBE-UNCOMPUTABLE inside the evaltrig()
function, then untriggerable triggers return -1. For example:
SET a evaltrig("MAYBE-UNCOMPUTABLE Mon SKIP OMIT Mon")
will set a to -1.
DEBUGGING REMINDER SCRIPTS
Although the command-line -d option is useful for debugging, it is often overkill. For
example, if you turn on the -dx option for a reminder file with many complex expressions,
you'll get a huge amount of output. The DEBUG command allows you to control the debugging
flags under program control. The format is:
DEBUG [+flagson] [-flagsoff]
Flagson and flagsoff consist of strings of the characters "extvlf" that correspond to the
debugging options discussed in the command-line options section. If preceded with a "+",
the corresponding group of debugging options is switched on. Otherwise, they are switched
off. For example, you could use this sequence to debug a complicated expression:
DEBUG +x
set a very_complex_expression(many_args)
DEBUG -x
THE DUMPVARS COMMAND
The command DUMPVARS displays the values of variables in memory. Its format is:
DUMPVARS [var...]
If you supply a space-separated list of variable names, the corresponding variables are
displayed. If you do not supply a list of variables, then all variables in memory are
displayed. To dump a system variable, put its name in the list of variables to dump. If
you put a lone dollar sign in the list of variables to dump, then all system variables
will be dumped.
THE ERRMSG COMMAND
The ERRMSG command has the following format:
ERRMSG body
The body is passed through the substitution filter (with an implicit trigger date of
today()) and printed to the error output stream. Example:
IF !defined("critical_var")
ERRMSG You must supply a value for "critical_var"
EXIT
ENDIF
THE EXIT COMMAND
The above example also shows the use of the EXIT command. This causes an unconditional
exit from script processing. Any queued timed reminders are discarded. If you are in
calendar mode (described next), then the calendar processing is aborted.
If you supply an INT-type expression after the EXIT command, it is returned to the calling
program as the exit status. Otherwise, an exit status of 99 is returned.
THE FLUSH COMMAND
This command simply consists of the word FLUSH on a line by itself. The command flushes
the standard output and standard error streams used by Remind. This is not terribly
useful to most people, but may be useful if you run Remind as a subprocess of another
program, and want to use pipes for communication.
CALENDAR MODE
If you supply the -c, -s or -p command-line option, then Remind runs in "calendar mode."
In this mode, Remind interprets the script repeatedly, performing one iteration through
the whole file for each day in the calendar. Reminders that trigger are saved in internal
buffers, and then inserted into the calendar in the appropriate places.
If you also supply the -a option, then Remind will not include timed reminders in the
calendar.
The -p option is used in conjunction with the Rem2PS program to produce a calendar in
PostScript format. For example, the following command will send PostScript code to
standard output:
remind -p .reminders | rem2ps
You can print a PostScript calendar by piping this to the lpr command.
If you have a reminder script called ".reminders", and you execute this command:
remind -c .reminders jan 1993
then Remind executes the script 31 times, once for each day in January. Each time it
executes the script, it increments the value of today(). Any reminders whose trigger date
matches today() are entered into the calendar.
MSG and CAL-type reminders, by default, have their entire body inserted into the calendar.
RUN-type reminders are not normally inserted into the calendar. However, if you enclose a
portion of the body in the %"...%" sequence, only that portion is inserted. For example,
consider the following:
REM 6 Jan MSG %"Dianne's birthday%" is %b
In the normal mode, Remind would print "Dianne's birthday is today" on 6 January.
However, in the calendar mode, only the text "Dianne's birthday" is inserted into the box
for 6 January.
If you explicitly use the %"...%" sequence in a RUN-type reminder, then the text between
the delimiters is inserted into the calendar. If you use the sequence %"%" in a MSG or
CAL-type reminder, then no calendar entry is produced for that reminder.
PRESERVING VARIABLES
Because Remind iterates through the script for each day in the calendar, slow operations
may severely reduce the speed of producing a calendar.
For example, suppose you set the variables "me" and "hostname" as follows:
SET me shell("whoami")
SET hostname shell("hostname")
Normally, Remind clears all variables between iterations in calendar mode. However, if
certain variables are slow to compute, and will not change between iterations, you can
"preserve" their values with the PRESERVE command. Also, since function definitions are
preserved between calendar iterations, there is no need to redefine them on each
iteration. Thus, you could use the following sequence:
IF ! defined("initialized")
set initialized 1
set me shell("whoami")
set hostname shell("hostname")
fset func(x) complex_expr
preserve initialized me hostname
ENDIF
The operation is as follows: On the first iteration through the script, "initialized" is
not defined. Thus, the commands between IF and ENDIF are executed. The PRESERVE command
ensures that the values of initialized, me and hostname are preserved for subsequent
iterations. On the next iteration, the commands are skipped, since initialized has
remained defined. Thus, time-consuming operations that do not depend on the value of
today() are done only once.
Most system variables (those whose names start with '$') are automatically preserved
between calendar iterations.
Note that for efficiency, Remind caches the reminder script (and any INCLUDEd files) in
memory when producing a calendar.
Timed reminders are sorted and placed into the calendar in time order. These are followed
by non-timed reminders. Remind automatically places the time of timed reminders in the
calendar according to the -b command-line option. Reminders in calendar mode are sorted
as if the -g option had been used; you can change the sort order in calendar mode by
explicitly using the -g option to specify a different order from the default.
REPEATED EXECUTION
If you supply a repeat parameter on the command line, and do not use the -c, -p, or -s
options, Remind operates in a similar manner to calendar mode. It repeatedly executes the
reminder script, incrementing today() with each iteration. The same rules about
preserving variables and function definitions apply. Note that using repeat on the
command line also enables the -q option and disables any -z option. As an example, if you
want to see how Remind will behave for the next week, you can type:
remind .reminders '*7'
If you want to print the dates of the next 1000 days, use:
(echo 'banner %'; echo 'msg [today()]%') | remind - '*1000'
INITIALIZING VARIABLES ON THE COMMAND LINE
The -i option is used to initialize variables on the Remind command line. The format is
-ivar=expr, where expr is any valid expression. Note that you may have to use quotes or
escapes to prevent the shell from interpreting special characters in expr. You can have
as many -i options as you want on the command line, and they are processed in order.
Thus, if a variable is defined in one -i option, it can be referred to by subsequent -i
options.
Note that if you supply a date on the command line, it is not parsed until all options
have been processed. Thus, if you use today() in any of the -i expressions, it will
return the same value as realtoday() and not the date supplied on the command line.
Any variables defined on the command line are preserved as with the PRESERVE command.
You should not have any spaces between the -i option and the equal sign; otherwise,
strange variable names are created that can only be accessed with the value() or defined()
functions.
You can also define a function on the command line by using:
-ifunc(args)=definition
Be sure to protect special characters from shell interpretation.
MORE ABOUT POSTSCRIPT
The PS and PSFILE reminders pass PostScript code directly to the printer. They differ in
that the PS-type reminder passes its body directly to the PostScript output (after
processing by the substitution filter) while the PSFILE-type's body should simply consist
of a filename. The Rem2PS program will open the file named in the PSFILE-type reminder,
and include its contents in the PostScript output.
The PostScript-type reminders for a particular day are included in the PostScript output
in sorted order of priority. Note that the order of PostScript commands has a major
impact on the appearance of the calendars. For example, PostScript code to shade a
calendar box will obliterate code to draw a moon symbol if the moon symbol code is placed
in the calendar first. For this reason, you should not provide PS or PSFILE-type
reminders with priorities; instead, you should ensure that they appear in the reminder
script in the correct order. PostScript code should draw objects working from the
background to the foreground, so that foreground objects properly overlay background ones.
If you prioritize these reminders and run the script using descending sort order for
priorities, the PostScript output will not work.
All of the PostScript code for a particular date is enclosed in a save-restore pair.
However, if several PostScript-type reminders are triggered for a single day, each section
of PostScript is not enclosed in a save-restore pair - instead, the entire body of
included PostScript is enclosed.
PostScript-type reminders are executed by the PostScript printer before any regular
calendar entries. Thus, regular calendar entries will overlay the PostScript-type
reminders, allowing you to create shaded or graphical backgrounds for particular days.
Before executing your PostScript code, the origin of the PostScript coordinate system is
positioned to the bottom left-hand corner of the "box" in the calendar representing
today(). This location is exactly in the middle of the intersection of the bottom and
left black lines delineating the box - you may have to account for the thickness of these
lines when calculating positions.
Several PostScript variables are available to the PostScript code you supply. All
distance and size variables are in PostScript units (1/72 inch.) The variables are:
LineWidth
The width of the black grid lines making up the calendar.
Border The border between the center of the grid lines and the space used to print
calendar entries. This border is normally blank space.
BoxWidth and BoxHeight
The width and height of the calendar box, from center-to-center of the black
gridlines.
InBoxHeight
The height from the center of the bottom black gridline to the top of the regular
calendar entry area. The space from here to the top of the box is used only to
draw the day number.
/DayFont, /EntryFont, /SmallFont, /TitleFont and /HeadFont
The fonts used to draw the day numbers, the calendar entries, the small calendars,
the calendar title (month, year) and the day-of-the-week headings, respectively.
DaySize, EntrySize, TitleSize and HeadSize
The sizes of the above fonts. (The size of the small calendar font is not defined
here.) For example, if you wanted to print the Hebrew date next to the regular day
number in the calendar, use:
REM PS Border BoxHeight Border sub DaySize sub moveto \
/DayFont findfont DaySize scalefont setfont \
([hebday(today())] [hebmon(today())]) show
Note how /DayFont and DaySize are used.
Note that if you supply PostScript code, it is possible to produce invalid PostScript
files. Always test your PostScript thoroughly with a PostScript viewer before sending it
to the printer. You should not use any document structuring comments in your PostScript
code.
DAEMON MODE
If you use the -z command-line option, Remind runs in the "daemon" mode. In this mode, no
"normal" reminders are issued. Instead, only timed reminders are collected and queued,
and are then issued whenever they reach their trigger time.
In addition, Remind wakes up every few minutes to check the modification date on the
reminder script (the filename supplied on the command line.) If Remind detects that the
script has changed, it re-executes itself in daemon mode, and interprets the changed
script.
In daemon mode, Remind also re-reads the remind script when it detects that the system
date has changed.
In daemon mode, Remind acts as if the -f option had been used, so to run in the daemon
mode in the background, use:
remind -z .reminders &
If you use sh or bash, you may have to use the "nohup" command to ensure that the daemon
is not killed when you log out.
PURGE MODE
If you supply the -j command-line option, Remind runs in purge mode. In this mode, it
tries to purge expired reminders from your reminder files.
In purge mode, Remind reads your reminder file and creates a new file by appending
".purged" to the original file name. Note that Remind never edits your original file; it
always creates a new .purged file.
If you invoke Remind against a directory instead of a file, then a .purged file is created
for each *.rem file in the directory.
Normally, Remind does not create .purged files for INCLUDed files. However, if you supply
a numeric argument after -j, then Remind will create .purged files for the specified level
of INCLUDE. For example, if you invoke Remind with the argument -j2, then .purged files
will be created for the file (or directory) specified on the command line, any files
included by them, and any files included by those files. However, .purged files will not
be created for third-or-higher level INCLUDE files.
Determining which reminders have expired is extremely tricky. Remind does its best, but
you should always compare the .purged file to the original file and hand-merge the changes
back in.
Remind annotates the .purged file as follows:
An expired reminder is prefixed with: #!P: Expired:
In situations where Remind cannot reliably determine that something was expired, you may
see the following comments inserted before the problematic line:
#!P: Cannot purge SATISFY-type reminders
#!P: The next IF evaluated false...
#!P: REM statements in IF block not checked for purging.
#!P: The previous IF evaluated true.
#!P: REM statements in ELSE block not checked for purging
#!P: The next IFTRIG did not trigger.
#!P: REM statements in IFTRIG block not checked for purging.
#!P: Next line has expired, but contains expression... please verify
#!P: Next line may have expired, but contains non-constant expression
#!P! Could not parse next line: Some-Error-Message-Here
Remind always annotates .purged files with lines beginning with "#!P". If such lines are
encountered in the original file, they are not copied to the .purged file.
SORTING REMINDERS
The -g option causes Remind to sort reminders by trigger date, time and priority before
issuing them. Note that reminders are still calculated in the order encountered in the
script. However, rather than being issued immediately, they are saved in an internal
buffer. When Remind has finished processing the script, it issues the saved reminders in
sorted order. The -g option can be followed by up to four characters that must all be "a"
or "d". The first character specifies the sort order by trigger date (ascending or
descending), the second specifies the sort order by trigger time and the third specifies
the sort order by priority. If the fourth character is "d", the untimed reminders are
sorted before timed reminders. The default is to sort all fields in ascending order and
to sort untimed reminders after timed reminders.
In ascending order, reminders are issued with the most imminent first. Descending order
is the reverse. Reminders are always sorted by trigger date, and reminders with the same
trigger date are then sorted by trigger time. If two reminders have the same date and
time, then the priority is used to break ties. Reminders with the same date, time and
priority are issued in the order they were encountered.
You can define a user-defined function called SORTBANNER that takes one DATE-type
argument. In sort mode, the following sequence happens:
If Remind notices that the next reminder to issue has a different trigger date from the
previous one (or if it is the first one to be issued), then SORTBANNER is called with the
trigger date as its argument. The result is coerced to a string, and passed through the
substitution filter with the appropriate trigger date. The result is then displayed.
Here's an example - consider the following fragment:
# Switch off the normal banner
BANNER %
REM 11 March 1993 ++1 MSG Not so important
REM 17 March 1993 ++7 MSG Way in the future
REM 10 March 1993 MSG Important Reminder
REM 11 March 1993 ++1 MSG Not so important - B
FSET sortbanner(x) iif(x == today(), \
"***** THINGS TO DO TODAY *****", \
"----- Things to do %b -----")
Running this with the -gaa option on 10 March 1993 produces the following output:
***** THINGS TO DO TODAY *****
Important Reminder
----- Things to do tomorrow -----
Not so important
Not so important - B
----- Things to do in 7 days' time -----
Way in the future
You can use the args() built-in function to determine whether or not SORTBANNER has been
defined. (This could be used, for example, to provide a default definition for SORTBANNER
in a system-wide file included at the end of the user's file.) Here's an example:
# Create a default sortbanner function if it hasn't already
# been defined
if args("sortbanner") != 1
fset sortbanner(x) "--- Things to do %b ---"
endif
MSGPREFIX() AND MSGSUFFIX()
You can define two functions in your script called msgprefix() and msgsuffix(). They
should each accept one argument, a number from 0 to 9999.
In normal mode, for MSG- and MSF-type reminders, the following sequence occurs when Remind
triggers a reminder:
o If msgprefix() is defined, it is evaluated with the priority of the reminder as its
argument. The result is printed. It is not passed through the substitution
filter.
o The body of the reminder is printed.
o If msgsuffix() is defined, it is evaluated with the priority of the reminder as its
argument. The result is printed. It is not passed through the substitution
filter.
Here's an example: The following definition causes priority-0 reminders to be preceded by
"URGENT", and priority-6000 reminders to be preceded by "(not important)".
fset msgprefix(x) iif(x==0, "URGENT: ", \
x==6000, "(not important) ", "")
In Calendar Mode (with the -c, -s or -p options), an analogous pair of functions named
calprefix() and calsuffix() can be defined. They work with all reminders that produce an
entry in the calendar (i.e., CAL- and possibly RUN-type reminders as well as MSG-type
reminders.)
NOTES
Normally, the body of a reminder is followed by a carriage return. Thus, the results of
msgsuffix() will appear on the next line. If you don't want this, end the body of the
reminder with a percentage sign, "%". If you want a space between your reminders, simply
include a carriage return (char(13)) as part of the msgsuffix() return value.
If Remind has problems evaluating msgprefix(), msgsuffix() or sortbanner(), you will see a
lot of error messages. For an example of this, define the following:
fset msgprefix(x) x/0
COMPILE-TIME SUPPORT FOR OTHER LANGUAGES
Your version of Remind may have been compiled to support a language other than English.
This support may or may not be complete - for example, all error and usage messages may
still be in English. However, at a minimum, non-English versions of Remind will output
names of months and weekdays in the selected language. Also, the substitution mechanism
will substitute constructs suitable for the selected language rather than for English.
Note that a non-English version of Remind will accept only English names of weekdays and
months in a reminder script.
RUN-TIME SUPPORT FOR OTHER LANGUAGES
Remind has run-time support for other languages, and it is expected that compile-time
support will be deprecated in favour of run-time support.
A number of system variables let you translate various phrases to other languages. These
system variables are:
$Monday, $Tuesday, $Wednesday, $Thursday, $Friday, $Saturday
Set each of these system variables to a string representing the corresponding day's
name in your language. Strings must be valid UTF-8 strings.
$January, $February, $March, $April, $May, $June, $July, $August, $September, $October,
$November, $December
Set each of these system variables to a string representing the corresponding
month's name in your language. Strings must be valid UTF-8 strings.
$Ago, $Am, $And, $At, $Hour, $Is, $Minute, $Now, $On, $Pm, $Was
Set each of these system variables to the translation of the corresponding English
word into your language. Note that $Am and $Pm should be the translations of "AM"
and "PM" (morning and afternoon time indicators) respectively.
$Hplu, $Mplu
Set these to the suffix to add to the word for "hour" and "minute" to make them
plural. In English, both would be set to "s".
$Fromnow
Set this to the translation of the English phrase "from now"
Note that if you set any of the language-related system variables, they should be set in a
section of your script that always is evaluated. If you set them inside an IF statement,
for example, results are unpredictable.
Note also that the Rem2PS back-end does not support the full range of UTF-8 characters.
The TkRemind, rem2html and rem2pdf back-ends all do support the full UTF-8 range.
RUN-TIME MODIFICATION OF THE SUBSTITUTION FILTER
The system variables mentioned in the previous section are not typically sufficient to
properly translate Remind's output to another language. Some languages have complicated
rules for AM vs PM times and others have complex rules for making words plural. Remind
therefore allows you to define a number of functions that modify the behavior of the
substitution filter at run-time. The functions are:
subst_ampm(h)
This function is passed a single integer, namely an hour from 0 to 23. It should
return a string that indicates "AM" or "PM" or even finer gradations in some
languages.
subst_ordinal(d)
This function is passed a single integer, namely a day of the month from 1 to 31.
It should return a string that is suffixed to the day number to turn it into an
ordinal number. In English, for example, the function might return "st", "nd",
"rd" or "th", depending on d.
subst_N(alt, date, time)
This is actually a family of functions, where N is a letter or number. This
function completely overrides the substitution sequence "%N". The three arguments
are an integer alt which, if non-zero, indicates that the alternate-mode
substitution sequence "%*N" was encountered; date which is the trigger date of the
reminder and time which is the trigger time.
subst_Nx(alt, date, time)
Again, this is a family of functions. It is similar to the subst_N family except
it is only called if date is two or more days away from today(). This is useful if
you don't want to override the "today" or "tomorrow" output for most substitution
sequences.
Here's an example of how you might customize your substitution filter. Suppose you want
to change the "%b" sequence to substitute "the day after tomorrow" for an event two days
from now. You could do this:
FSET subst_bx(a,d,t) iif(d==today()+2, "the day after tomorrow", \
"in " + (d-today()) + " days' time")
REM [today()+3] ++3 MSG Event 1 is %b%
REM [today()+2] ++3 MSG Event 2 is %b%
REM [today()+1] ++3 MSG Event 3 is %b%
REM [today()] ++3 MSG Event 4 is %b%
The output of this script is:
Event 1 is in 3 days' time
Event 2 is the day after tomorrow
Event 3 is tomorrow
Event 4 is today
Note how Event 2's wording was changed from the normal "in 2 days' time", and note also
that the "tomorrow" and "today" events used the normal substitution---subst_bx is not
called for trigger days of today or tomorrow.
As a special case, if a subst_Nx or subst_N function returns the integer zero, then the
normal substitution mechanism is used. Therefore, the previous example could have been
written more simply as:
FSET subst_bx(a,d,t) iif(d==today()+2, "the day after tomorrow", 0)
You can define your own substitution sequences in addition to the built-in ones as
follows: If you define a function named subst_name(alt, date, time), then the sequence
%{name} calls the function with alt set to 0 and date and time to the trigger date and
time, respectively. The %{name} sequence is replaced with whatever the function returns.
The sequence %*{name} is similar, but calls the function with alt set to 1.
If you use a %{name} sequence and the function subst_name is not defined or returns an
error, then %{name} is replaced with the empty string.
LANGUAGE PACKS
Remind ships with a number of language packs, which are simply reminder scripts located in
[$SysInclude]/lang. The currently-shipping language packs are:
da.rem (Danish), de.rem (German), es.rem (Spanish), fr.rem (French), is.rem (Icelandic),
it.rem (Italian), nl.rem (Dutch), no.rem (Norwegian), pl.rem (Polish), pt.rem (Portuguese)
and ro.rem (Romanian).
To use a language pack (in this example, de.rem), simply place this at the top of your
reminders file:
INCLUDE [$SysInclude]/lang/de.rem
If you want Remind to try to find the language pack appropriate for your locale settings,
use:
INCLUDE [$SysInclude]/lang/auto.rem
You are encouraged to study the language packs to see how to translate Remind into
additional languages.
THE HEBREW CALENDAR
Remind has support for the Hebrew calendar, which is a luni-solar calendar. This allows
you to create reminders for Jewish holidays, jahrzeits (anniversaries of deaths) and
smachot (joyous occasions.)
THE HEBREW YEAR
The Hebrew year has 12 months, alternately 30 and 29 days long. The months are: Tishrey,
Heshvan, Kislev, Tevet, Shvat, Adar, Nisan, Iyar, Sivan, Tamuz, Av and Elul. In Biblical
times, the year started in Nisan, but Rosh Hashana (Jewish New Year) is now celebrated on
the 1st and 2nd of Tishrey.
In a cycle of 19 years, there are 7 leap years, being years 3, 6, 8, 11, 14, 17 and 19 of
the cycle. In a leap year, an extra month of 30 days is added before Adar. The two Adars
are called Adar A and Adar B.
For certain religious reasons, the year cannot start on a Sunday, Wednesday or Friday. To
adjust for this, a day is taken off Kislev or added to Heshvan. Thus, a regular year can
have from 353 to 355 days, and a leap year from 383 to 385.
When Kislev or Heshvan is short, it is called chaser, or lacking. When it is long, it is
called shalem, or full.
The Jewish date changes at sunset. However, Remind will change the date at midnight, not
sunset. So in the period between sunset and midnight, Remind will be a day earlier than
the true Jewish date. This should not be much of a problem in practice.
The computations for the Jewish calendar were based on the program "hdate" written by Amos
Shapir of the Hebrew University of Jerusalem, Israel. He also supplied the preceding
explanation of the calendar.
HEBREW DATE FUNCTIONS
hebday(d_date)
Returns the day of the Hebrew month corresponding to the date parameter. For
example, 12 April 1993 corresponds to 21 Nisan 5753. Thus, hebday('1993/04/12')
returns 21.
hebmon(d_date)
Returns the name of the Hebrew month corresponding to date. For example,
hebmon('1993/04/12') returns "Nisan".
hebyear(d_date)
Returns the Hebrew year corresponding to date. For example, hebyear('1993/04/12')
returns 5753.
hebdate(i_day, s_hebmon [,id_yrstart [,i_jahr [,i_aflag]]])
The hebdate() function is the most complex of the Hebrew support functions. It can
take from 2 to 5 arguments. It returns a DATE corresponding to the Hebrew date.
The day parameter can range from 1 to 30, and specifies the day of the Hebrew
month. The hebmon parameter is a string that must name one of the Hebrew months
specified above. Note that the month must be spelled out in full, and use the
English transliteration shown previously. You can also specify "Adar A" and "Adar
B." Month names are not case-sensitive.
The yrstart parameter can either be a DATE or an INT. If it is a DATE, then the
hebdate() scans for the first Hebrew date on or after that date. For example:
hebdate(15, "Nisan", '1990/01/01')
returns 1990/03/30, because that is the first occurrence of 15 Nisan on or after 1
January 1990.
If yrstart is an INT, it is interpreted as a Hebrew year. Thus:
hebdate(22, "Kislev", 5756)
returns 1995/12/15, because that date corresponds to 22 Kislev, 5756. Note that
none of the Hebrew date functions will work with dates outside Remind's normal
range for dates.
If yrstart is not supplied, it defaults to today().
The jahr modifies the behaviour of hebdate() as follows:
If jahr is 0 (the default), then hebdate() keeps scanning until it finds a date
that exactly satisfies the other parameters. For example:
hebdate(30, "Adar A", 1993/01/01)
returns 1995/03/02, corresponding to 30 Adar A, 5755, because that is the next
occurrence of 30 Adar A after 1 January, 1993. This behaviour is appropriate for
Purim Katan, which only appears in leap years.
If jahr is 1, then the date is modified as follows:
o 30 Heshvan is converted to 1 Kislev in years when Heshvan is chaser
o 30 Kislev is converted to 1 Tevet in years when Kislev is chaser
o 30 Adar A is converted to 1 Nisan in non-leapyears
o Other dates in Adar A are moved to the corresponding day in Adar in non-
leapyears
This behaviour is appropriate for smachot (joyous occasions) and for some jahrzeits
- see "JAHRZEITS."
if jahr is 2, then the date is modified as follows:
o 30 Kislev and 30 Heshvan are converted to 29 Kislev and 29 Heshvan,
respectively, if the month is chaser
o 30 Adar A is converted to 30 Shvat in non-leapyears
o Other dates in Adar A are moved to the corresponding day in Adar in non-
leapyears
if jahr is not 0, 1, or 2, it is interpreted as a Hebrew year, and the behaviour is
calculated as described in the next section, "JAHRZEITS."
The aflag parameter modifies the behaviour of the function for dates in Adar during
leap years. The aflag is only used if yrstart is a DATE type.
The aflag only affects date calculations if hebmon is specified as "Adar". In leap
years, the following algorithm is followed:
o If aflag is 0, then the date is triggered in Adar B. This is the default.
o If aflag is 1, then the date is triggered in Adar A. This may be
appropriate for jahrzeits in the Ashkenazi tradition; consult a rabbi.
o If aflag is 2, then the date is triggered in both Adar A and Adar B of a
leap year. Some Ashkenazim perform jahrzeit in both Adar A and Adar B.
JAHRZEITS
A jahrzeit is a yearly commemoration of someone's death. It normally takes place on the
anniversary of the death, but may be delayed if burial is delayed - consult a rabbi for
more information.
In addition, because some months change length, it is not obvious which day the
anniversary of a death is. The following rules are used:
o If the death occurred on 30 Heshvan, and Heshvan in the year after the death is
chaser, then the jahrzeit is observed on 29 Heshvan in years when Heshvan is
chaser. Otherwise, the yahrzeit is observed on 1 Kislev when Heshvan is chaser.
o If the death occurred on 30 Kislev, and Kislev in the year after the death is
chaser, then the jahrzeit is observed on 29 Kislev in years when Kislev is chaser.
Otherwise, the yahrzeit is observed on 1 Tevet when Kislev is chaser.
o If the death occurred on 1-29 Adar A, it is observed on 1-29 Adar in non-leapyears.
o If the death occurred on 30 Adar A, it is observed on 30 Shvat in a non-leapyear.
Specifying a Hebrew year for the jahr parameter causes the correct behaviour to be
selected for a death in that year. You may also have to specify aflag, depending on your
tradition.
The jahrzeit information was supplied by Frank Yellin, who quoted "The Comprehensive
Hebrew Calendar" by Arthur Spier, and "Calendrical Calculations" by E. M. Reingold and
Nachum Dershowitz.
OUT-OF-BAND REMINDERS
The SPECIAL keyword is used to transmit "out-of-band" information to Remind backends, such
as tkremind or Rem2PS. They are used only when piping data from a remind -p line. (Note
that the COLOR special is an exception; it downgrades to the equivalent of MSG in remind's
normal mode of operation.)
The various SPECIALs recognized are particular for each backend; however, there are four
SPECIALs that all backends should attempt to support. They are currently supported by
Rem2PS, tkremind and rem2html.
The SHADE special replaces the psshade() function. Use it like this:
REM Sat Sun SPECIAL SHADE 128
REM Mon SPECIAL SHADE 255 0 0
The SHADE keyword is followed by either one or three numbers, from 0 to 255. If one
number is supplied, it is interpreted as a grey-scale value from black (0) to white (255).
If three numbers are supplied, they are interpreted as RGB components from minimum (0) to
maximum (255). The example above shades weekends a fairly dark grey and makes Mondays a
fully-saturated red. (These shadings appear in calendars produced by Rem2PS, tkremind and
rem2html.)
The MOON special replaces the psmoon() function. Use it like this:
REM [moondate(0)] SPECIAL MOON 0
REM [moondate(1)] SPECIAL MOON 1
REM [moondate(2)] SPECIAL MOON 2
REM [moondate(3)] SPECIAL MOON 3
These draw little moons on the various calendars. The complete syntax of the MOON special
is as follows:
... SPECIAL MOON phase moonsize fontsize msg
Phase is a number from 0 to 3, with 0 representing a new moon, 1 the first quarter, 2 a
full moon and 3 the last quarter.
moonsize is the diameter in PostScript units of the moon to draw. If omitted or supplied
as -1, the backend chooses an appropriate size.
fontsize is the font size in PostScript units of the msg
Msg is additional text that is placed near the moon glyph.
Note that only the Rem2PS backend supports moonsize and fontsize; the other backends use
fixed sizes.
The COLOR special lets you place colored reminders in the calendar. Use it like this:
REM ... SPECIAL COLOR 255 0 0 This is a bright red reminder
REM ... SPECIAL COLOR 0 128 0 This is a dark green reminder
You can spell COLOR either the American way ("COLOR") or the British way ("COLOUR"). This
manual will use the American way.
Immediately following COLOR should be three decimal numbers ranging from 0 to 255
specifying red, green and blue intensities, respectively. The rest of the line is the
text to put in the calendar.
The COLOR special is "doubly special", because in its normal operating mode, remind treats
a COLOR special just like a MSG-type reminder. Also, if you invoke Remind with -@[n],
then it approximates SPECIAL COLOR reminders on your terminal.
See also the documentation of the $DefaultColor system variable in the section "SYSTEM
VARIABLES".
The WEEK special lets you place annotations such as the week number in the calendar. For
example, this would number each Monday with the ISO 8601 week number. The week number is
shown like this: "(Wn)" in this example, but you can put whatever text you like after the
WEEK keyword.
REM Monday SPECIAL WEEK (W[weekno()])
MISCELLANEOUS
COMMAND ABBREVIATIONS
The following tokens can be abbreviated:
o REM can be omitted - it is implied if no other valid command is present.
o CLEAR-OMIT-CONTEXT --> CLEAR
o PUSH-OMIT-CONTEXT --> PUSH
o POP-OMIT-CONTEXT --> POP
o DUMPVARS --> DUMP
o BANNER --> BAN
o INCLUDE --> INC
o SCANFROM --> SCAN
NIFTY EXAMPLES
This section is a sampling of what you can do with Remind.
REM 5 Feb 1991 AT 14:00 +45 *30 \
RUN mail -s "Meeting at %2" $LOGNAME </dev/null &
On 5 February, 1991, this reminder will mail you reminders of a 2:00pm meeting at 1:15,
1:45 and 2:00. The subject of the mail message will be "Meeting at 2:00pm" and the body
of the message will be blank.
REM AT 17:00 RUN echo "5:00pm - GO HOME!" | xless -g +0+0 &
This reminder will pop up an xless window at 5:00pm every day. The xless window will
contain the line "5:00pm - GO HOME!"
REM AT 23:59 RUN (sleep 120; remind -a [filename()]) &
This reminder will run at one minute to midnight. It will cause a new Remind process to
start at one minute past midnight. This allows you to have a continuous reminder service
so you can work through the night and still get timed reminders for early in the morning.
Note that this trick is no longer necessary, providing you run Remind in daemon mode.
remind -c12 /dev/null Jan 1993
This invocation of Remind will cause it to print a calendar for 1993, with all entries
left blank.
REM CAL [trigdate()-date(year(trigdate()), 1, 1)+1]
This example puts an entry in each box of a calendar showing the number (1-365 or 366) of
the day of the year.
REM Tue 2 Nov SATISFY (year(trigdate())%4) == 0
IF trigvalid()
REM [trigdate()] ++5 MSG \
U.S. Presidential Election!!
ENDIF
This example warns you 5 days ahead of each American presidential election. The first REM
command calculates the first Tuesday after the first Monday in November. (This is
equivalent to the first Tuesday on or after 2 November.) The SATISFY clause ensures that
the trigger date is issued only in election years, which are multiples of 4. The second
REM command actually issues the reminder.
DETAILS ABOUT TRIGGER COMPUTATION
Here is a conceptual description of how triggers are calculated. Note that Remind
actually uses a much more efficient procedure, but the results are the same as if the
conceptual procedure had been followed.
Remind starts from the current date (that is, the value of today()) and scans forward,
examining each day one at a time until it finds a date that satisfies the trigger, or can
prove that no such dates (on or later than today()) exist.
If Remind is executing a SATISFY-type reminder, it evaluates the expression with
trigdate() set to the date found above. If the expression evaluates to zero or the null
string, Remind continues the scanning procedure described above, starting with the day
after the trigger found above.
The SCANFROM clause (having a syntax similar to UNTIL) can modify the search strategy
used. In this case, Remind begins the scanning procedure at scan_date, which is the date
specified in the SCANFROM clause. For example:
REM Mon 1 SCANFROM 17 Jan 1992 MSG Foo
The example above will always have a trigger date of Monday, 3 February 1992. That is
because Remind starts scanning from 17 January 1992, and stops scanning as soon as it hits
a date that satisfies "Mon 1."
The main use of SCANFROM is in situations where you want to calculate the positions of
floating holidays. Consider the Labour Day example shown much earlier. Labour Day is the
first Monday in September. It can move over a range of 7 days. Consider the following
sequence:
REM Mon 1 Sept SCANFROM [today()-7] ADDOMIT MSG Labour Day
REM Mon AFTER MSG Hello
The SCANFROM clause makes sure that Remind begins scanning from 7 days before the current
date. This ensures that Labour Day for the current year will continue to be triggered
until 7 days after it has occurred. This allows you to safely use the AFTER keyword as
shown.
As a special case, you can simply use a negative number after SCANFROM; a negative number
-N is interpreted as N days before today. Thus, the previous example could also be
written like this:
REM Mon 1 Sept SCANFROM -7 ADDOMIT MSG Labour Day
REM Mon AFTER MSG Hello
In general, use SCANFROM as shown for safe movable OMITs. The amount you should scan back
by (7 days in the example above) depends on the number of possible consecutive OMITted
days that may occur, and on the range of the movable holiday. Generally, a value of 7 is
safe.
The FROM clause operates almost like the counterpoint to UNTIL. It prevents the reminder
from triggering before the FROM date. For example, the following reminder:
REM Mon Thu FROM 23 Jul 2007 UNTIL 2 Aug 2007 MSG Test
will trigger on Mondays and Thursdays between 23 July 2007 and 2 August 2007 inclusive.
FROM is really just syntactic sugar; you could implement the reminder above as follows:
REM Mon Thu SCANFROM [max(today(), '2007-07-23')] \
UNTIL 2 Aug 2007 MSG Test
but that's a lot harder to read. Internally, Remind treats FROM exactly as illustrated
using SCANFROM. For that reason, you cannot use both FROM and SCANFROM.
Note that if you use one REM command to calculate a trigger date, perform date
calculations (addition or subtraction, for example) and then use the modified date in a
subsequent REM command, the results may not be what you intended. This is because you
have circumvented the normal scanning mechanism. You should try to write REM commands
that compute trigger dates that can be used unmodified in subsequent REM commands. The
file "defs.rem" that comes with the Remind distribution contains examples.
DETAILS ABOUT TRIGVALID()
The trigvalid() function returns 1 if Remind could find a trigger date for the previous
REM or IFTRIG command. More specifically, it returns 1 if Remind finds a date not before
the starting date of the scanning that satisfies the trigger. In addition, there is one
special case in which trigvalid() returns 1 and trigdate() returns a meaningful result:
If the REM or IFTRIG command did not contain an UNTIL clause, and contained all of the
day, month and year components, then Remind will correctly compute a trigger date, even if
it happens to be before the start of scanning. Note that this behaviour is not true for
versions of Remind prior to 03.00.01.
AUTHOR
Dianne Skoll <dianne@skoll.ca> wrote Remind. The moon code was copied largely unmodified
from "moontool" by John Walker. The sunrise and sunset functions use ideas from programs
by Michael Schwartz and Marc T. Kaufman. The Hebrew calendar support was taken from
"hdate" by Amos Shapir. OS/2 support was done by Darrel Hankerson, Russ Herman, and
Norman Walsh. The supported languages and their translators are listed below. Languages
marked "complete" support error messages and usage instructions in that language; all
others only support the substitution filter mechanism and month/day names.
German -- Wolfgang Thronicke
Dutch -- Willem Kasdorp and Erik-Jan Vens
Finnish -- Mikko Silvonen (complete)
French -- Laurent Duperval (complete)
Norwegian -- Trygve Randen
Danish -- Mogens Lynnerup
Polish -- Jerzy Sobczyk (complete)
Brazilian Portuguese -- Marco Paganini (complete)
Italian -- Valerio Aimale
Romanian -- Liviu Daia
Spanish -- Rafa Couto
Icelandic -- Björn Davíðsson
BUGS
There's no good reason why read-only system variables are not implemented as functions, or
why functions like version(), etc. are not implemented as read-only system variables.
Hebrew dates in Remind change at midnight instead of sunset.
Remind has some built-in limits (for example, number of global OMITs.)
BIBLIOGRAPHY
Nachum Dershowitz and Edward M. Reingold, "Calendrical Calculations", Software-Practice
and Experience, Vol. 20(9), Sept. 1990, pp 899-928.
L. E. Doggett, Almanac for computers for the year 1978, Nautical Almanac Office, USNO.
Richard Siegel and Michael and Sharon Strassfeld, The First Jewish Catalog, Jewish
Publication Society of America.
HOME PAGE
https://dianne.skoll.ca/projects/remind/
SEE ALSO
rem(1), rem2ps(1), rem2pdf(1), tkremind(1), rem2html(1)