Thanks, @capink! I believe that "calibre-debug -r" is exactly what I was looking for.
My main concern is being able to run 
non GUI plugins, so this command should be perfect. "calibre-debug -h" had all the details; I should have looked more carefully:
	Quote:
	
	
		
			
				  -r RUN_PLUGIN, --run-plugin=RUN_PLUGIN 
                        Run a plugin that provides a command line interface. 
                        For example: 
                        calibre-debug -r "Plugin name" -- file1 --option1 
                        Everything after the -- will be passed to the plugin 
                        as arguments.
			
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 Thanks again!