Provided by: nmh_1.6-8build1_amd64 
NAME
pick - search for messages by content
SYNOPSIS
pick [+folder] [msgs] [-and ...] [-or ...] [-not ...] [-lbrace ... -rbrace] [--component pattern]
[-cc pattern] [-date pattern] [-from pattern] [-search pattern] [-subject pattern] [-to pattern]
[-after date] [-before date] [-datefield field] [-sequence name ...] [-nosequence] [-public |
-nopublic] [-zero | -nozero] [-list | -nolist] [-version] [-help]
typical usage:
scan `pick -from jones`
pick -to holloway -sequence select
show `pick -before friday`
DESCRIPTION
Pick searches within a folder for messages with the specified contents, and then identifies those
messages. Two types of search primitives are available: pattern matching and date constraint operations.
A modified grep(1) is used to perform the matching, so the full regular expression (see ed(1)) facility
is available within pattern. With -search, pattern is used directly, and with the others, the grep
pattern constructed is:
`component[ \t]*:.*pattern'
This means that the pattern specified for a -search will be found everywhere in the message, including
the header and the body, while the other pattern matching requests are limited to the single specified
component. The expression
`--component pattern'
is a shorthand for specifying
`-search “component[ \t]*:.*pattern” '
It is used to pick a component which is not one of “To:”, “cc:”, “Date:”, “From:”, or “Subject:”. An
example is “pick --reply-to pooh”.
Pattern matching is performed on a per-line basis. Within the header of the message, each component is
treated as one long line, but in the body, each line is separate. Lower-case letters in the search
pattern will match either lower or upper case in the message, while upper case will match only upper
case.
Note that since the -date switch is a pattern matching operation (as described above), to find messages
sent on a certain date the pattern string must match the text of the “Date:” field of the message.
Independent of any pattern matching operations requested, the switches -after date or -before date may
also be used to introduce date/time constraints on all of the messages. By default, the “Date:” field is
consulted, but if another date yielding field (such as “BB-Posted:” or “Delivery-Date:”) should be used,
the -datefield field switch may be used.
With -before and -after, pick will actually parse the date fields in each of the messages specified in
`msgs' and compare them to the date/time specified. If -after is given, then only those messages whose
“Date:” field value is chronologically after the date specified will be considered. The -before switch
specifies the complimentary action.
Both the -after and -before switches take legal RFC 822-style date specifications as arguments. Pick
will default certain missing fields so that the entire date need not be specified. These fields are (in
order of defaulting): timezone, time and timezone, date, date and timezone. All defaults are taken from
the current date, time, and timezone.
In addition to RFC 822-style dates, pick will also recognize any of the days of the week (“sunday”,
“monday”, and so on), and the special dates “today”, “yesterday” (24 hours ago), and “tomorrow” (24 hours
from now). All days of the week are judged to refer to a day in the past (e.g., telling pick “saturday”
on a “tuesday” means “last saturday” not “this saturday”).
Finally, in addition to these special specifications, pick will also honor a specification of the form
“-dd”, which means “dd days ago”.
Pick supports complex boolean operations on the searching primitives with the -and, -or, -not, and
-lbrace ... -rbrace switches. For example,
pick -after yesterday -and
-lbrace -from freida -or -from fear -rbrace
identifies messages recently sent by “frieda” or “fear”.
The matching primitives take precedence over the -not switch, which in turn takes precedence over -and
which in turn takes precedence over -or. To override the default precedence, the -lbrace and -rbrace
switches are provided, which act just like opening and closing parentheses in logical expressions.
If no search criteria are given, all the messages specified on the command line are selected (this
defaults to “all”).
Once the search has been performed, if the -list switch is given, the message numbers of the selected
messages are written to the standard output separated by newlines. This is extremely useful for quickly
generating arguments for other nmh programs by using the “backquoting” syntax of the shell. For example,
the command
scan `pick +todo -after “31 Mar 83 0123 PST”`
says to scan those messages in the indicated folder which meet the appropriate criterion. Note that
since pick's context changes are written out prior to scan's invocation, you need not give the folder
argument to scan as well.
The -sequence name switch may be given once for each sequence the user wishes to define. For each
sequence named, that sequence will be defined to mean exactly those messages selected by pick. For
example,
pick -from frated -seq fred
defines a new message sequence for the current folder called “fred” which contains exactly those messages
that were selected.
The -nosequence switch will disable all previously named sequences, allowing those established by a
profile component to be overridden.
By default, pick will zero a sequence before adding it. This action can be disabled with the -nozero
switch, which means that the messages selected by pick will be added to the sequence, if it already
exists, and any messages already a part of that sequence will remain so.
The -public and -nopublic switches are used by pick in the same way mark uses them.
Output when no messages are matched
If pick is used in a backquoted operation, such as
scan `pick -from jones`
and pick selects no messages (e.g., no messages are from “jones”), then the shell will still run the
outer command (e.g., scan). Since no messages were matched, pick produced no output, and the argument
given to the outer command as a result of backquoting pick is empty. In the case of nmh programs, the
outer command now acts as if the default `msg' or `msgs' should be used (e.g., “all” in the case of
scan). To prevent this unexpected behavior, if -list was given, and if its standard output is not a tty,
then pick outputs the illegal message number “0” when it fails. This lets the outer command fail
gracefully as well.
FILES
$HOME/.mh_profile The user profile
PROFILE COMPONENTS
Path: To determine the user's nmh directory
Current-Folder: To find the default current folder
SEE ALSO
mark(1)
DEFAULTS
`+folder' defaults to the current folder
`msgs' defaults to all
`-datefield date'
`-zero'
`-list' is the default if no `-sequence', `-nolist' otherwise
CONTEXT
If a folder is given, it will become the current folder.
HISTORY
In previous versions of MH, the pick command would show, scan, or refile the selected messages. This was
rather “inverted logic” from the UNIX point of view, so pick was changed to define sequences and output
those sequences. Hence, pick can be used to generate the arguments for all other MH commands, instead of
giving pick endless switches for invoking those commands itself.
Also, previous versions of pick balked if you didn't specify a search string or a date/time constraint.
The current version does not, and merely matches the messages you specify. This lets you type something
like:
show `pick last:20 -seq fear`
instead of typing
mark -add -nozero -seq fear last:20
show fear
Finally, timezones used to be ignored when comparing dates: they aren't any more.
HELPFUL HINTS
Use “pick sequence -list” to enumerate the messages in a sequence (such as for use by a shell script).
BUGS
Any occurrence of -datefield must occur prior to the -after or -before switch it applies to.
The pattern syntax “[l-r]” is not supported; each letter to be matched must be included within the square
brackets.