prerm is in prboom-plus 2:2.5.1.5+svn4531+dfsg1-1.
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 | #!/bin/sh
set -e
if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]
then
update-alternatives --remove doom /usr/games/prboom-plus
update-alternatives --remove boom /usr/games/prboom-plus
fi
exit 0
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