Unknown option --help
Usage : /usr/bin/xmlcatalog [options] catalogfile entities...
	Parse the catalog file (void specification possibly expressed as ""
	appoints the default system one) and query it for the entities
	--sgml : handle SGML Super catalogs for --add and --del
	--shell : run a shell allowing interactive queries
	--create : create a new catalog
	--add 'type' 'orig' 'replace' : add an XML entry
	--add 'entry' : add an SGML entry
	--del 'values' : remove values
	--noout: avoid dumping the result on stdout
	         used with --add or --del, it saves the catalog changes
	         and with --sgml it automatically updates the super catalog
	--no-super-update: do not update the SGML super catalog
	-v --verbose : provide debug information