The command:
geeqie --action=<action> can be used to simulate keyboard actions. An example is: geeqie --action="ZoomIn" The actions available are shown in the Edit/Preferences/Keyboard dialog. The two end columns are relevant. The final component of the Accel column is the action code that should be used. The Tooltip column provides a description of the action. Both columns can be sorted by clicking the header. The available action codes may also be listed by: geeqie --action-list