To set a mandatory number of workspaces, execute the following command:
# gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type int --set /apps/metacity/general/num_workspaces integer
To set a default number of workspaces, execute the following command:
# gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults --type int --set /apps/metacity/general/num_workspaces integer
You can also set other window manager preferences. For information about the other window manager preferences, see the metacity.schemas schema definition file.