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After you install/remove lots of packages, there are many packages marked with 'rc'. This script help you to purge these packages, it will save some spaces from your disk.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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Isn't this what 'apt-get purge --auto-remove' or 'dpkg -Pa' does?
Also, why are you using grep|awk?
This is more clean:
dpkg -l |awk '/^r/ {print $2}'
Also, since aptitude just calls apt, which just calls dpkg, why not (assuming that you have config files left over after a package remove and that you're trying to clean up creft that apt-get and dpkg aren't catching on their own):
dpkg --purge `dpkg -l |awk '/^r/{print $2}'`
You clearly are learning/understanding the shell, but you should read a little about useless use of grep (and maybe cat, too):
http://partmaps.org/era/unix/award.html
thanks a lot for your comment.
> Isn't this what 'apt-get purge --auto-remove' or 'dpkg -Pa' does?
no, I had tried these 2 command, they are differnt from my command.