This file is indexed.

preinst is in ferm 2.2-1.

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

action=$1
version=$2

if [ "$action" = upgrade ]; then
    # remove old cache files
    rm -f /var/cache/ferm/*.sh /var/cache/ferm/*.tmp
fi

if [ "$action" = upgrade -a -n "$version" ]; then
    if dpkg --compare-versions "$version" lt "1.1.1" &&
        dpkg --compare-versions "$version" gt "1.1-1"; then
        # upgrade from the 1.2 alpha ("1.1+svnXX") releases

        # this flag has been obsoleted, it is now a variable in
        # /etc/default/ferm
        rm -f /etc/ferm/disabled_on_bootup
    fi
fi