This file is indexed.

postinst is in bsdutils 1:2.20.1-1ubuntu3.

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 [ -L /usr/doc/bsdutils ] ; then
    rm -f /usr/doc/bsdutils
fi