This file is indexed.

postinst is in libc6-dev-x32 2.23-0ubuntu3.

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

case $1 in
	(configure)
	# We want /usr/include/bits and /usr/include/gnu to become
	# symlinks, but only after succesfully unpacking libc6-dev-alt
	if ! test -h /usr/include/bits ; then
		rm -rf /usr/include/bits
		ln -sf x86_64-linux-gnu/bits /usr/include/
	fi
	if ! test -h /usr/include/gnu ; then
		rm -rf /usr/include/gnu
		ln -sf x86_64-linux-gnu/gnu /usr/include/
	fi
	;;
	(*)
	;;
esac