This file is indexed.

prerm is in lua5.1 5.1.5-8.1+b2.

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.

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#!/bin/sh -e

case "$1" in
    remove)
        update-alternatives --remove lua-interpreter /usr/bin/lua5.1
        update-alternatives --remove lua-compiler /usr/bin/luac5.1
        ;;
esac