gdk-pixbuf-thumbnailer -V (return code: 1)
Expects an input and an output file
gdk-pixbuf-thumbnailer --help (return code: 0)
Usage:
gdk-pixbuf-thumbnailer [OPTION?] [INPUT FILE] [OUTPUT FILE] Thumbnail images
Help Options:
-h, --help Show help options
Application Options:
-s, --size Size of the thumbnail in pixels
--g-fatal-warnings Make all warnings fatal