RRDtool 1.11.0  Copyright by Tobi Oetiker

Usage: rrdupdate <filename>
			[--locking|-L <try|block|none>]
			[--template|-t ds-name[:ds-name]...]
			[--skip-past-updates]
			time|N:value[:value...]

			at-time@value[:value...]

			[ time:value[:value...] ..]

ERROR: invalid option -- 'help'