prerm is in liblua50-dev 5.0.3-6.
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 | #!/bin/sh
set -e
if [ "$1" != "upgrade" ]; then
update-alternatives --remove lua-configuration /usr/bin/lua-config50
fi
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