You can run calendar whenever you like, but it might be more useful to put it in your profile file (~/.bash_profile if you use the bash shell). Then calendar will run each time you log in to the system.
I keep my personal calendar file in the doc/etc/ subdirectory of my home directory, so I would include the following line in my profile:
cd /home/m/doc/etc/; calendar; cd
Putting the same line in your .bashrc file (again, only if you use the bash shell—others are different) also works to run calendar each time you start a shell.
Sometimes even this isn't enough—if your machine is on all the time and you haven't been starting any new shells or xterms, you might miss a reminder. So you could schedule a cron job to run calendar each day, e-mailing the output to you as a reminder.
The cal program displays a text calendar. If you call it without any options by typing:
the current month will be displayed on the terminal like this (assuming September, 1998):
September 1998 S M Tu W Th F S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30It's pretty no-frills, but can work on any terminal. To get a calendar of the whole year, call cal with the year as argument.
cal -ywill print a calendar for the current year.
cal can also display any arbitrary month. If you want to see the month of December 1999, for instance, use:
cal 12 1999
in which case you'll see:
December 1999 S M Tu W Th F S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
While cal is quite useful for creating simple calendars, sometimes when printing you might want a nicer output. pcal is a program that creates very nice calendars in PostScript. Its options are very similar to that of cal. It is available from http://garbo.uwasa.fi/unix/pcal.html.
Other programs that handle calendar functions in a more graphically-intense way (and can be used only in X) include ical, at http://www.research.digital.com/SRC/personal/Sanjay_Ghemawat/ical/home.html and plan, found at http://www.in-berlin.de/User/bitrot/plan.html. There are many variants of the basic UNIX calendar programs—check the Linux Software Map for more.
With this overview of the power and flexibility of these simple calendar programs, you too can leave your analog calendar systems behind.
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