The jekyll program has several commands but the structure is always:
jekyll command [argument] [option] [argument_to_option]
Examples:
    jekyll new site/ --blank
    jekyll serve --config _alternative_config.yml


jekyll help			# Generates help documentation\
jekyll help build	# Shows help, optionally for a given subcommand
jekyll doctor		# Checks for URL conflicts
jekyll clean		# Removes all generated files: destination folder, metadata file, Sass and Jekyll caches.