pnmtorle --version (return code: 0)
pnmtorle: Using libpbm from Netpbm Version: Netpbm 10.0
pnmtorle: BSD defined
pnmtorle: RGB_ENV='RGBDEF'
pnmtorle: RGBENV= 'RGBDEF' (env vbl is unset)
pnmtorle -H (return code: 255)
extra arguments not processed
usage : pnmtorle [-v] [-h] [-a] [-o outfile] [pnmfile]
Convert a PNM file to URT RLE format.
-a Fake an alpha channel. Alpha=0 when input=0, 255 otherwise.
-h Print header of PNM file and exit.
-v Verbose mode.