postrm is in libfm4 1.2.4-1ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh
set -e
case "${1}" in
	purge)
		# remove cache files if no other gio module is left
		if ! ls /usr/lib/gio/modules/*.so > /dev/null 2>&1
		then
			rm -f /usr/lib/gio/modules/giomodule.cache
		fi
		;;
	remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
		;;
	*)
		echo "postrm called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac
exit 0
 |