Removes all deleted but not purged packages on Debian and Ubuntu systems.
When you remove packages via dpkg, apt-get or aptitude, it doesn't remove everything, it leaves things like configuration files behind. You can tell each of these commands to delete those as well (i.e. purge), but I sometimes forget. Plus apt-get autoremove can't do it.
In the past few years, I regularly did something like this:
for i in `dpkg -l | grep ^rc | cut -d" " -f 3`; do dpkg -P $i; done
But today I was fed up with that. Today I created this script.
Download the script,
put in on root's $PATH and make it executable.
Just execute dpkg-purge-deleted as root. Don't worry, it will ask
you before purging anything.