gnome-characters -V (return code: -5)
(gjs:24009): Gjs-ERROR **: option parsing failed: Missing argument for -I
gnome-characters --help (return code: 0)
Usage:
org.gnome.Characters [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:
--display=DISPLAY X display to use