wallpaper -V (return code: 1)
wallpaper Version 0.1 Author: Jan Kandziora <jjj@gmx.de>
Licensed under the terms of the GNU General Public License, Version 2
See http://www.gnu.org/licenses/gpl.txt for details
wallpaper --help (return code: 1)
USAGE: wallpaper [OPTIONS] FILE ...
-w --min-width Set the minimum width. Defaults to 780.
-x --max-width Set the maximum width. Defaults to 4000.
-a --min-aspect Set the minimum aspect ratio. Defaults to 1.30.
-b --max-aspect Set the maximum aspect ratio. Defaults to 1.36.
-X --exclude Set the exclude file type list. Defaults to "".
-I --include Set the include file type list. Defaults to "JPEG,PNG,GIF,GIF87".
-v --verbose Print additonal info to stderr.
--help Print this help and exit.
--version Print the version and exit.