This file is indexed.

/usr/src/glibc/debian/debhelper.in/locales.prerm is in eglibc-source 2.19-0ubuntu6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

case "$1" in
    remove|purge)
    	# This test should be kept only for compatibility with old 
	# locales-all packages, new ones don't use locale-archive.
    	if ! [ -f /usr/lib/locales-all/supported.tar.lzma ] ; then
		# If locales-all is not installed, clean the locales
		rm -f /usr/lib/locale/locale-archive
	fi
	;;
    *)
    	;;
esac

#DEBHELPER#

exit 0