feh(1) --hide-pointer -qrzZFD 2.0 /media/USB/images --caption-path /media/USB/images/captions
image viewer and cataloguer
-Y, --hide-pointer
        Hide the pointer (useful for slideshows).
-q, --quiet
        Don't report non-fatal errors for failed loads.  Verbose and quiet modes are not mutually
        exclusive, the first controls informational messages, the second only errors.
-r, --recursive
        Recursively expand any directories in the commandline arguments to the content of those
        directories, all the way down to the bottom level.
-z, --randomize
        When viewing multiple files in a slideshow, randomize the file list before displaying.
-Z, --auto-zoom
        Zoom pictures to screen size in fullscreen / fixed geometry mode.
-F, --fullscreen
        Make the window fullscreen.  Note that in this mode, large images will always be scaled down to fit
        the screen, --zoom zoom only affects smaller images and never scales larger than necessary to fit
        the screen size. The only exception is a zoom of 100, in which case images will always be shown at
        100% zoom, no matter their dimensions.
-D, --slideshow-delay float
        For slideshow mode, wait float seconds between automatically changing slides.  Useful for
        presentations.  Specify a negative number to set the delay (which will then be float * (-1)), but
        start feh in paused mode.
-K, --caption-path path
        Path to directory containing image captions.  This turns on caption viewing, and if captions are
        found in path, which is relative to the directory of each image, they are overlayed on the
        displayed image.  E.g. with caption path "captions/", and viewing image "images/foo.jpg", the
        caption will be looked for in "images/captions/foo.jpg.txt".
source manpages: feh