This file is indexed.

preinst is in dctrl-tools 2.23ubuntu1.

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

dpkg-maintscript-helper rm_conffile \
    /etc/grep-dctrl.rc 2.20.1 dctrl-tools -- "$@"