qlmanage -h

macbookpro-tk:~ tk$ qlmanage -h
Usage: qlmanage [OPTIONS] path...
	-h		Display this help
	-r		Force reloading Generators list
	-r cache	Reset thumbnail disk cache
	-m [name ...]	Display statistics about quicklookd. Stats names:
			* plugins	Show the generators list
			* server	Show quicklookd life information
			* memory	Show quicklookd memory consumption
			* burst		Show statistics about the last burst
			* threads	Show concurrent accesses stats
			* other		Show other information about quicklookd
	-d debugLevel	Integer between 1-4
	-p		Compute previews of the documents
	-t		Compute thumbnails of the documents
	-x		Use quicklookd (remote computation)
	-i		Compute thumbnail in icon mode
	-s size		Size for the thumbnail
	-f factor	Scale factor for the thumbnail
	-F factor	Scale factor for the thumbnail, draw downscaled and compare to 1x
	-z		Display generation performance info (don't display thumbnails)
	-o dir		Output result in dir (don't display thumbnails or previews)
	-c contentType	Force the content type used for the documents
	-g generator	Force the generator to use