This file is indexed.

prerm is in rt4-clients 4.0.19-1.

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.

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#! /bin/sh

set -e

alts() {
    update-alternatives --remove rt /usr/bin/rt-4
    update-alternatives --remove rt-mailgate /usr/bin/rt-mailgate-4
}

case "$1" in
    remove)
        alts
	;;
esac