prerm is in nethack-x11 3.4.3-14.
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 | #!/bin/sh
set -e
update-alternatives --remove nethack /usr/lib/games/nethack/nethack-x11.sh
update-alternatives --remove nethack /usr/lib/games/nethack/nethack-x11-tty.sh
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