Provided by: dateutils_0.4.5-1.1_amd64 bug

NAME

       dategrep - Grep standard input for lines that match EXPRESSION.

SYNOPSIS

       dategrep [OPTION]...  EXPRESSION

DESCRIPTION

       Grep standard input for lines that match EXPRESSION.

       EXPRESSION  may  be  date/times prefixed with an operator `<', `<=', `=', `>=', `>', `!=',
       `<>' (if omitted defaults to `='), which will match lines with date/times which are older,
       older-equal, equal, newer-equal, newer, or not equal respectively.

       EXPRESSION  may  also  be  format  specifiers infixed by above operators and suffixed by a
       value (e.g.  `%a="Wed"')  which  matches  lines  whose  %a  representation  (weekday  name
       abbreviated) is "Wed".

       EXPRESSION   may   be  statements  as  described  above  concatenated  through  `&&'  (for
       conjunction) or `||' (disjunction), both of which may be parenthesised  as  per  usual  to
       change precedence (`&&' goes over `||').

       If  multiple  date/times  occur on the same line and any one of them fulfills the criteria
       then the line is considered a match and will be output.

       Note:
         Operations can be specified by options (--eq, --gt, ...) as well.
         This serves solely as a means of convenience, e.g. the dtest tool has a
         similar syntax.

       Recognized OPTIONs:

       -h, --help
              Print help and exit

       -V, --version
              Print version and exit

       -q, --quiet
              Suppress message about date/time and duration parser errors.

       -i, --input-format=STRING...
              Input format, can be used multiple times.  Each date/time will  be  passed  to  the
              input  format  parsers  in  the  order  they  are given, if a date/time can be read
              successfully with a given input format specifier string, that value will be used.

       -b, --base=DT
              For underspecified input use DT as a fallback to fill in missing fields.  Also used
              for  ambiguous format specifiers to position their range on the absolute time line.
              Must be a date/time  in  ISO8601  format.   If  omitted  defaults  to  the  current
              date/time.

       -e, --backslash-escapes
              Enable interpretation of backslash escapes in the output and input format specifier
              strings.

       -o, --only-matching
              Show only the part of a line matching DATE.

       -v, --invert-match
              Select non-matching lines.

       --from-locale=LOCALE
              Interpret dates on stdin or the command line as coming from the locale LOCALE, this
              would  only  affect  month  and weekday names as input formats have to be specified
              explicitly.

       --from-zone=ZONE
              Consider date/times on stdin as coming from the zone ZONE, default: UTC.

       -z, --zone=ZONE
              Consider date/times in EXPRESSION as coming from the zone ZONE, default: UTC.

       --eq   Lines match when date/times are equal to EXPRESSION.

       --ne   Lines match when date/times are not the same as EXPRESSION.

       --gt   Lines match when date/times are newer than EXPRESSION.

       --lt   Lines match when date/times are older than EXPRESSION.

       --ge   Lines match when date/times are newer than or equal EXPRESSION.

       --le   Lines match when date/times are older than or equal EXPRESSION.

       --nt   Lines match when date/times are newer than or equal EXPRESSION.

       --ot   Lines match when date/times are older than or equal EXPRESSION.

FORMAT SPECS

       Format specs in dateutils are similar to posix' strftime().

       However, due to a broader range of supported calendars  dateutils  must  employ  different
       rules.

       Date specs:
         %a  The abbreviated weekday name
         %A  The full weekday name
         %_a The weekday name shortened to a single character (MTWRFAS)
         %b  The abbreviated month name
         %B  The full month name
         %_b The month name shortened to a single character (FGHJKMNQUVXZ)
         %c  The count of the weekday within the month (range 00 to 05)
         %C  The count of the weekday within the year (range 00 to 53)
         %d  The day of the month, 2 digits (range 00 to 31)
         %D  The day of the year, 3 digits (range 000 to 366)
         %F  Equivalent to %Y-%m-%d (ymd's canonical format)
         %g  ISO week date year without the century (range 00 to 99)
         %G  ISO week date year including the century
         %j  Equivalent to %D
         %m  The month in the current calendar (range 00 to 19)
         %Q  The quarter of the year (range Q1 to Q4)
         %q  The number of the quarter (range 01 to 04)
         %s  The number of seconds since the Epoch.
         %u  The weekday as number (range 01 to 07, Sunday being 07)
         %U  The week count,  day of week is Sun (range 00 to 53)
         %V  The ISO week count,  day of week is Mon (range 01 to 53)
         %w  The weekday as number (range 00 to 06, Sunday being 00)
         %W  The week count,  day of week is Mon (range 00 to 53)
         %y  The year without a century (range 00 to 99)
         %Y  The year including the century
         %_y The year shortened to a single digit
         %Z  The zone offset in hours and minutes (HH:MM) with
             a preceding sign (+ for offsets east of UTC, - for offsets
             west of UTC)

         %Od The day as roman numerals
         %Om The month as roman numerals
         %Oy The two digit year as roman numerals
         %OY The year including the century as roman numerals

         %rs In time systems whose Epoch is different from the unix Epoch, this
             selects the number of seconds since then.
         %rY In calendars with years that don't coincide with the Gregorian
             years, this selects the calendar's year.

         %dth  The day of the month as an ordinal number, 1st, 2nd, 3rd, etc.
         %mth  The month of the year as an ordinal number, 1st, 2nd, 3rd, etc.

         %db The business day of the month (since last month's ultimo)
         %dB Number of business days until this month's ultimo

       Time specs:
         %H  The hour of the day using a 24h clock, 2 digits (range 00 to 23)
         %I  The hour of the day using a 12h clock, 2 digits (range 01 to 12)
         %M  The minute (range 00 to 59)
         %N  The nanoseconds (range 000000000 to 999999999)
         %p  The string AM or PM, noon is PM and midnight is AM.
         %P  Like %p but in lowercase
         %S  The  (range 00 to 60, 60 is for leap seconds)
         %T  Equivalent to %H:%M:%S

       General specs:
         %n  A newline character
         %t  A tab character
         %%  A literal % character

       Modifiers:
         %O  Modifier to turn decimal numbers into Roman numerals
         %r  Modifier to turn units into real units
         %0  Modifier to turn on zero prefixes
         %SPC  Modifier to turn on space prefixes
         %-  Modifier to turn off prefixes altogether
         th  Suffix, read and print ordinal numbers
         b   Suffix, treat days as business days

       By design dates before 1601-01-01 are not supported.

       For  conformity  here  is  a  list  of calendar designators and their corresponding format
       string:
         ymd     %Y-%m-%d
         ymcw    %Y-%m-%c-%w
         ywd     %rY-W%V-%u
         bizda   %Y-%m-%db
         lilian     n/a
         ldn        n/a
         julian     n/a
         jdn        n/a
         matlab     n/a
         mdn        n/a

       These designators can be used as output format string, moreover,  @code{lilian}/@code{ldn}
       and @code{julian}/@code{jdn} can also be used as input format string.

EXAMPLES

         $ dgrep 2012-03-01 <<EOF
         2012-02-28
         2012-02-29
         2012-03-01
         2012-03-02
         EOF
         2012-03-01
         $

         $ dgrep '<2012-03-01' <<EOF
         2012-02-28
         2012-02-29
         2012-03-01
         2012-03-02
         EOF
         2012-02-28
         2012-02-29
         $

         $ dgrep \!=2012-03-01 <<EOF
         2012-02-28
         2012-02-29
         2012-03-01
         2012-03-02
         EOF
         2012-02-28
         2012-02-29
         2012-03-02
         $

         $ dgrep =2012-03-01 <<EOF
         Feb     2012-02-28
         Feb     2012-02-29     leap day
         Mar     2012-03-01
         Mar     2012-03-02
         EOF
         Mar     2012-03-01
         $

         $ dgrep -o \<2012-03-01 <<EOF
         Feb     2012-02-28
         Feb     2012-02-29     leap day
         Mar     2012-03-01
         Mar     2012-03-02
         EOF
         2012-02-28
         2012-02-29
         $

         $ dgrep '>=12:00:00' <<EOF
         fileA   11:59:58
         fileB   11:59:59  leap ?
         fileNOON     12:00:00  new version
         fileC   12:03:12
         EOF
         fileNOON     12:00:00  new version
         fileC   12:03:12
         $

         $ dgrep -o '>=12:00:00' <<EOF
         fileA   11:59:58
         fileB   11:59:59  leap ?
         fileNOON     12:00:00  new version
         fileC   12:03:12
         EOF
         12:00:00
         12:03:12
         $

         $ dgrep 2012-03-01 <<EOF
         2012-02-28T10:00:00
         2012-02-29T10:00:00
         2012-03-01T10:00:00
         2012-03-02T10:00:00
         EOF
         2012-03-01T10:00:00
         $

         $ dgrep '<2012-03-01' <<EOF
         2012-02-28T10:00:00
         2012-02-29T10:00:00
         2012-03-01T10:00:00
         2012-03-02T10:00:00
         EOF
         2012-02-28T10:00:00
         2012-02-29T10:00:00
         $

         $ dgrep 2012-03-01T10:00:00 <<EOF
         2012-02-28T10:00:00
         2012-02-29T10:00:00
         2012-03-01T10:00:00
         2012-03-02T10:00:00
         EOF
         2012-03-01T10:00:00
         $

         $ dgrep '<2012-03-01T14:00:00' <<EOF
         2012-02-28T10:00:00
         2012-02-29T10:00:00
         2012-03-01T10:00:00
         2012-03-02T10:00:00
         EOF
         2012-02-28T10:00:00
         2012-02-29T10:00:00
         2012-03-01T10:00:00
         $

AUTHOR

       Written by Sebastian Freundt <freundt@fresse.org>

REPORTING BUGS

       Report bugs to: https://github.com/hroptatyr/dateutils/issues

SEE ALSO

       The  full  documentation  for dategrep is maintained as a Texinfo manual.  If the info and
       dategrep programs are properly installed at your site, the command

              info (dateutils)dategrep

       should give you access to the complete manual.