qalculate -V (return code: 1)
Unable to init server: Could not connect: Connection refused
(qalculate:2922): Gtk-WARNING **: cannot open display:
qalculate --help (return code: 0)
Usage:
qalculate [OPTION?] EXPRESSION
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:
-n, --new-instance Start a new instance of the application
--display=DISPLAY X display to use