sxiv
Simple X Image Viewer.
TLDR
Open an image
$ sxiv [path/to/file]
Open an image in fullscreen mode
$ sxiv -f [path/to/file]
Open a newline-separated list of images, reading filenames from standard input
$ echo [path/to/file] | sxiv -i
Open a space-separated list of images as a slideshow
$ sxiv -S [seconds] [path/to/file]
Open a space-separated list of images in thumbnail mode
$ sxiv -t [path/to/file]