Also, gphoto2 is great for interacting with cameras using the command line.  I will typically use it to import&#x2F;backup all the images directly from a camera but it has so many more features. I believe darktable uses it behind the scenes, but it is extremely powerful on its own.<p>Another good command line program is dcraw, especially for batch developing RAW photos. These two programs probably make up more than half of my photography workflow.