postrm is in portreserve 0.0.4-1.
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 27 28 29 30 31 32 33 34 35 36  | #! /bin/sh
# postrm script for portreserve 
#
# see: dh_installdeb(1)
set -e
case "$1" in
	purge)
		# Note: DO NOT purge /etc/portreserve, it's created 
		# by other packages, not by us
		for dir in /var/run/portreserve
		do
			[ -d "$dir" ] &&  {
				rm -rf $dir
			}
		done
	;;
	remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
# Do nothing 
	;;
	*)
	echo "postrm called with unknown argument \`$1'" >&2
	exit 0
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d portreserve remove >/dev/null || exit $?
fi
# End automatically added section
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