This file is indexed.

preinst is in docbook-dsssl 1.79-7ubuntu1.

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_installcatalogs
if [ "$1" = "upgrade" ] && ! dpkg-query -S /etc/sgml/docbook-dsssl.cat >/dev/null 2>&1; then
	# If the dpkg-query command returns non-zero, the central catalog is
	# not owned by any package. This is due to an old behaviour of
	# debhelper. Now that file becomes a conffile. In order to avoid a
	# question during installation, we remove the old non-conffile.
	rm -f /etc/sgml/docbook-dsssl.cat
fi
# End automatically added section