postrm is in monit 1:5.3.2-1.
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 37  | #!/bin/sh
set -e
case "$1" in
  upgrade|failed-upgrade|abort-install|abort-upgrade|remove|disappear)
    ;;
  purge)
    # Remove logfile:
    rm -f /var/log/monit.log
    # Remove the state and id files (default location):
    rm -f /var/lib/monit/state /var/lib/monit/id
    # Remove monit from /etc/aliases:
    if [ -f /etc/aliases ] || [ -L /etc/aliases ]
    then
      if grep -qi "^monit[[:space:]]*:" /etc/aliases
      then
        sed -i '/^monit[[:space:]]*:.*$/d' /etc/aliases
        test -x /usr/bin/newaliases && newaliases || :
      fi
    fi
    ;;
  *)
    echo "postrm called with unknown argument \`$1'" >&2
    exit 1
    ;;
esac
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d monit remove >/dev/null
fi
# End automatically added section
exit 0
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