This file is indexed.

postinst is in apache2-doc 2.2.22-1ubuntu1.11.

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 -e

if [ -x "/etc/init.d/apache2" ]; then
        if [ -x /usr/sbin/invoke-rc.d ]; then
                invoke-rc.d apache2 reload ||true
        else
                /etc/init.d/apache2 reload ||true
        fi
fi