Calendar Programs

Mr. Stutz introduces us to a digital method for keeping track of appointments and those important dates in our lives.
Automating Calendar

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.

Using cal

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 30
It'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 1950
cal -y
will 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

Other Calendar Programs

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

Other programs that handle calendar functions in a more graphically-intense way (and can be used only in X) include ical, at and plan, found at 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.

Michael Stutz is a writer whose first novel, Sunclipse, is freely distributed under GNU GPL copyleft—just like Linux—and is on the Web at He can be reached via e-mail at


One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix