This file is indexed.

postinst is in update-notifier 0.154.1.

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

STAMP=/var/lib/update-notifier/dpkg-run-stamp

if [ ! -f $STAMP ]; then
	touch $STAMP
fi