This file is indexed.

postinst is in rfkill 0.5-1ubuntu3.

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
set -e
if [ "$1" = configure ]; then
    # ensure rfkill devices have ID_PATH (fixed in systemd 215-5ubuntu2)
    udevadm trigger --subsystem-match=rfkill
fi