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Finds the difference between a list of ports that you want to have on your system and the list of ports currently installed. When called as portdiff, it produces diff(1)-like output, when called as portorphans it prints a list of ports that are installed but are not in your list of wanted ports. To create your list of wanted ports, do something like: $ portorphans | perl -pe 's/-\d.*$//' > ~/.portdiffrc then edit the .portdiffrc file to remove the ports you don't want. My usual port maintenance routine goes something like: 1) portupgrade -a 2) portorphans a) If portorphans returns nothing, I'm done b) If portorphans' output contains a port I wish to keep, I add that to ~/.portdiffrc and goto 2. c) If portorphans returns some output, I run 'portorphans | xargs pkg_delete' and goto 2. This keeps the list of ports installed on my machine to a minimum.