prerm is in traceroute 1:2.1.0-2.
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 | #!/bin/sh
set -e
case "${1}" in
	remove|upgrade|deconfigure)
		update-alternatives --remove traceroute /usr/bin/traceroute.db
		for _ALTERNATIVE in traceroute6 lft traceproto
		do
			update-alternatives --remove ${_ALTERNATIVE} /usr/bin/${_ALTERNATIVE}.db
		done
		for _ALTERNATIVE in tcptraceroute
		do
			update-alternatives --remove ${_ALTERNATIVE} /usr/sbin/${_ALTERNATIVE}.db
		done
		;;
	failed-upgrade)
		;;
	*)
		echo "prerm called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac
exit 0
 |