This file is indexed.

postinst is in linux-headers-4.15.0-23-generic 4.15.0-23.25.

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

version=4.15.0-23-generic

if [ "$1" != configure ]; then
    exit 0
fi

if [ -d /etc/kernel/header_postinst.d ]; then
    DEB_MAINT_PARAMS="$*" run-parts --report --exit-on-error --arg=$version \
		/etc/kernel/header_postinst.d
fi

exit 0