gnome-clocks --version (return code: 0)
gnome-clocks 3.25.90
gnome-clocks --help (return code: 0)
Usage:
gnome-clocks [OPTION?]
Help Options:
-h, --help Show help options
--help-all Show all help options
--help-gapplication Show GApplication options
--help-gtk Show GTK+ Options
Application Options:
-v, --version Print version information and exit
--display=DISPLAY X display to use