onboard accepts the following command-line options:
-h,--help
Display a help with all available command line options and exit.
-l<LAYOUT>,--layout=<LAYOUT>
Layout file (.onboard) or name
-t<THEME>,--theme=<THEME>
Theme file (.theme) or name
-x<X> Window x position
-y<Y> Window y position
-s<SIZE>,--size=<SIZE>
Window size, widthxheight
-e,--xid
Start in XEmbed mode, e.g. for gnome-screensaver
-a,--keep-aspect
Keep aspect ratio when resizing the window
-d<DEBUG>,--debug=<DEBUG>
<DEBUG>={notset|debug|info|warning|error|critical}
-m,--allow-multiple-instances
Allow multiple Onboard instances
-q<QUIRKS>,--quirks=<QUIRKS>
Override auto-detection and manually select quirks QUIRKS={metacity|compiz|mutter}
--not-show-in=<DESKTOPS>
Silently fail to start in the given desktop environments. <DESKTOPS> is a comma-separated list of
XDG desktop names, e.g. GNOME for GNOME Shell.
-g,--log-learning
log all learned text; off by default