07-03-2014
Expanding on Don's question a bit -
There are different Regular expressions that work with different tools - for example: perl, grep, awk.
In order to answer your question we need to know what tool you want to use. There are "flavors" of regular expressions and they have differences.
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/
//
/abc
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LEARN ABOUT ULTRIX
calendar
calendar(1) General Commands Manual calendar(1)
Name
calendar - calendar reminder service
Syntax
calendar [-]
Description
The command consults the file `calendar' in the current directory and prints out lines that contain today's or tomorrow's date. The com-
mand recognizes most month-day dates, such as Dec. 7, december 7, 12/7, but it does not recognize dates formatted in the following ways: 7
December or 7/12. If you give the month as * with a date, such as, * 1, that day in any month will do. On weekends, specifying tomorrow
extends through Monday.
When an argument is present, the command searches through a user's calendar file in his login directory and sends him any positive results
by Normally this is done daily under control of
The calendar file is first run through the C preprocessor, to include any other calendar files specified with the #include syntax.
Included calendars are shared by all users, and are maintained and documented by the local administration.
Options
- Functions for every user who has a calendar file in his login directory.
Restrictions
The extended idea of tomorrow does not account for holidays.
Files
calendar
/usr/lib/calendar to figure out today's and tomorrow's dates
/etc/passwd
/tmp/cal*
/lib/cpp, egrep, sed, mail as subprocesses
See Also
at(1), cron(8), mail(1)
calendar(1)