This file is indexed.

preinst is in libc6-dev-i386 2.15-0ubuntu10.

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
	(upgrade|install)
	# We want /usr/include/bits and /usr/include/gnu to become
	# symlinks
	if ! test -h /usr/include/bits ; then
		rm -rf /usr/include/bits
	fi
	if ! test -h /usr/include/gnu ; then
		rm -rf /usr/include/gnu
	fi

	# We want /usr/include/sys to be a normal directory instead
	# of a symlink
	if test -h /usr/include/sys ; then
		rm -f /usr/include/sys
	fi
	;;
	(*)
	;;
esac