postrm is in nagios3-cgi 3.5.1-1ubuntu1.
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 | #!/bin/sh -e
# some shorthands for sanity
en="/etc/nagios3"
enc="/etc/nagios3/conf.d"
usn="/usr/share/nagios3"
case "$1" in
  remove)
  	;;
  purge)
	rm -f /etc/nagios3/htpasswd.users
	rm -f /etc/nagios3/apache2.conf
	if which ucf >/dev/null 2>&1; then
		ucf --purge /etc/nagios3/apache2.conf
	fi
    ;;
esac
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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