rar is a command line utitility used to create RAR archives in Linux.

Since the source code isn't available, this SlackBuild packages the 
official binary.  

NOTE: This is only an evaluation copy.
If you wish to use RAR after the evaluation period of 40 days, you will
have to purchase its license: http://www.rarlab.com/registration.php

Recommended, but not scrictly required: unrar (available on SlackBuilds.org)

Also note that this is an i386 binary - it won't work on pure x86_64 systems.