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a - archive
m5 - compression level, 0= lowest compression...1...2...3...4...5= max compression
-v5M split the output file in 5 megabytes archives, change to 700 for a CD, or 4200 for a DVD
R recursive for directories, do not use it for files
It's better to have the output of a compression already split than use the 'split' command after compression, would consume the double amount of disk space. Found at http://www.ubuntu-unleashed.com/2008/05/howto-create-split-rar-files-in-ubuntu.html
There are 2 alternatives - vote for the best!
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what i ask myself now is: who wants to use rar on unix?
I use sometimes unrar-gpl as unfortunatly neither tar+{gzip,bzip,lzma} nor 7z are widely used.
rar is proprietary junkware! Learn Unix:
tar czv Pictures | split -d -a 3 -b 5M - pics.tar.gz.^that doesn't "consume" any extra space and decompresses like so...
cat pics.tar.gz.??? | tar xzv^extract on any Unix - no extra proprietary junkware to install!
When you are making torrents to share, rar is the standard format for multi-file packages. And some torrent users do work on Linux.