postrm is in snmptrapfmt 1.14+nmu1ubuntu1.
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  | #!/bin/sh
set -e
# remove pid and pipe file only when being removed
case "$1" in
  "remove"| "purge"| "abort-install")
    # make sure pipe and pid file are removed
    rm -f /var/run/snmptrapfmt.p /var/run/snmptrapfmt.pid
    ;;
  *)
    ;;
esac
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d snmptrapfmt remove >/dev/null
fi
# End automatically added section
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