This file is indexed.

postinst is in ntpdate 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13.

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

if dpkg-maintscript-helper supports rm_conffile; then
	dpkg-maintscript-helper rm_conffile \
		/etc/dhcp3/dhclient-enter-hooks.d/ntpdate 1:4.2.6+dfsg-1 -- "$@"
fi

if dpkg-maintscript-helper supports mv_conffile; then
	dpkg-maintscript-helper mv_conffile \
		/etc/dhcp3/dhclient-exit-hooks.d/ntpdate \
		/etc/dhcp/dhclient-exit-hooks.d/ntpdate \
		1:4.2.6.p1+dfsg-1 -- "$@"
fi