This file is indexed.

postinst is in libnspr4 2:4.13.1-0ubuntu0.16.04.1.

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
if [ "$1" = "configure" ]; then
	ldconfig
fi