This file is indexed.

preinst is in postgresql-common 154.

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

case "$1" in
    install|upgrade)
	dpkg-divert --package postgresql-common --rename --divert /usr/bin/pg_config.libpq-dev --add /usr/bin/pg_config
        ;;

    abort-upgrade)
        ;;

    *)
        echo "$0 called with unknown argument \`$1'" 1>&2
        exit 1
        ;;
esac