How do I rar a file into several parts in Linux?
Ah I misunderstood, for parting rar files you have to do the following. First make sure you have rar installed. Then use the following command:
rar a -v250000k /path/m.splitted.rar /path/m.avi
a for append, -v for the size in kilobytes. This would create /path/m.splitted.part001.rar, /path/m.splitted.part002.rar, etc.
If you want the old naming scheme (m.splitted.rar as the first file, then m.splitted.r01, m.splitted.r02, etc.) you should use -vn instead of -v. See /usr/share/doc/rar/rar.txt for more information.