This file is indexed.

postinst is in hostname 3.15ubuntu1.

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
# Automatically added by dh_installinit
if [ -x "/etc/init.d/hostname" ]; then
	if [ ! -e "/etc/init/hostname.conf" ]; then
		update-rc.d hostname defaults >/dev/null
	fi
fi
# End automatically added section
# Automatically added by dh_installinit
update-rc.d -f hostname remove >/dev/null || exit $?
# End automatically added section