darktable-cli -V (return code: 1)
this is darktable-cli 2.2.5
copyright (c) 2012-2017 johannes hanika, tobias ellinghaus
darktable-cli --help (return code: 1)
usage: darktable-cli <input file> [<xmp file>] <output file> [--width <max width>,--height <max height>,--bpp <bpp>,--hq <0|1|true|false>,--upscale <0|1|true|false>,--verbose] [--core <darktable options>]