This file is indexed.

prerm is in libnginx-mod-http-cache-purge 1.14.0-0ubuntu1.

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
# Automatically added by dh_nginx/UNDECLARED
if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ] ; then
	for confpair in mod-http-cache-purge.conf:50-mod-http-cache-purge.conf  ; do
		from=$(echo $confpair | cut -d: -f1)
		to=$(echo $confpair | cut -d: -f2)

		if [ -L /etc/nginx/modules-enabled/$to ]; then
			mv /etc/nginx/modules-enabled/$to /etc/nginx/modules-enabled/$to.removed
		fi
	done
fi
# End automatically added section