postrm is in heroes 0.21-16.
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 | #!/bin/sh
set -e
if [ "$1" = "purge" ]
then
rm -fr /var/games/heroes
fi
|