gcr-viewer --version (return code: 0)
GCR Certificate and Key Viewer -- 3.18.0
gcr-viewer --help (return code: 0)
Usage:
gcr-viewer [OPTION...] [file...] - View certificate and key files
Help Options:
-h, --help Show help options
--help-all Show all help options
--help-gtk Show GTK+ Options
Application Options:
--version Show the application's version
--display=DISPLAY X display to use