This file is indexed.

postinst is in jarwrapper 0.40ubuntu1.

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 test -x /usr/sbin/update-binfmts ; then 
   update-binfmts --install jarwrapper /usr/bin/jarwrapper --magic 'PK\x03\x04' --detector /usr/bin/jardetector
fi