This file is indexed.

preinst is in devscripts 2.16.2ubuntu3.

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

for cf in chdist debchange debsign pkgnames uupdate; do
    dpkg-maintscript-helper rm_conffile /etc/bash_completion.d/devscripts."$cf" 2.15.5~ devscripts -- "$@"
done