gphoto2 --get-all-files
Downloading 'IMG_0015.JPG' from folder '/store_00010001/DCIM/100CANON'...     
Saving file as IMG_0015.JPG                                                   
Downloading 'IMG_0016.JPG' from folder '/store_00010001/DCIM/100CANON'...
Saving file as IMG_0016.JPG                                                   
Downloading 'IMG_0017.JPG' from folder '/store_00010001/DCIM/100CANON'...
Saving file as IMG_0017.JPG                                                   
Downloading 'IMG_0018.JPG' from folder '/store_00010001/DCIM/100CANON'...
Saving file as IMG_0018.JPG