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One Day One Command
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gphoto2 — Client to access the Digital cameras.

Summary:

gphoto2 is a command-line client written using the gphoto2 cross
platform digital camera library. We can access the digital cameras,
which is connected to a GNU/Linux System thru the USB Port.

Examples:

$ gphoto2 — Show help message.

$ gphoto2 –list-cameras — List all supported cameras.

$ gphoto2 –list-ports — List supported port devices.

$ gphoto2 –auto-detect — List detected cameras.

$ gphoto2 –camera “USB PTP Class Camera” — If camera is not auto
                   
       detected the specify the generic type.

$ gphoto2 -a — Show camera abilities.

$ gphoto2 -P — Get all files from camera.

$ gphoto2 -p 1,4-6 — Get only photos 1,4,5,6.

$ gphoto2 -T — Get all thumbnails images.

$ gphoto2 –debug — Show more detailed info. Useful to debug.

Read: man gphoto2