prerm is in inetutils-traceroute 2:1.9.2-1.
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 | #!/bin/sh
set -e
case "$1" in
remove|deconfigure)
update-alternatives --remove traceroute /usr/bin/inetutils-traceroute
;;
*)
esac
|