yelp --version (return code: 0)
yelp 3.18.1
yelp --help (return code: 0)
Usage:
yelp [OPTION...]
Help Options:
-h, --help Show help options
--help-all Show all help options
--help-gtk Show GTK+ Options
Application Options:
--editor-mode Turn on editor mode
--display=DISPLAY X display to use