gnome-character-map --version (return code: 0)
GNOME Character Map 3.18.2
gnome-character-map --help (return code: 0)
Usage:
gucharmap [OPTION...] [STRING…]
Help Options:
-h, --help Show help options
--help-all Show all help options
--help-gtk Show GTK+ Options
Application Options:
--font=FONT Font to start with; ex: 'Serif 27'
--display=DISPLAY X display to use