$ diff -s <(man make.conf | perl -0pe 's/^.*?PORTAGE_RSYNC_OPTS =[^"]+"([^"]+)".*/\1/s','s/ +/ /g' | tr -d '\n' | perl -pe 's/ /\n/g' | tr -d "'" | sort) <(emerge --info | grep -i git | egrep -io '"[^"]+"' | cut -d '"' -f 2 | sed 's/ /\n/g' | sort) | egrep -i '^<|^>' > --exclude=/.git > --human-readable > --omit-dir-times Maybe just refer people to emerge --info or something else that isn't a duplication?