pi3topbm --version (return code: 0)
pi3topbm: Using libpbm from Netpbm Version: Netpbm 10.0
pi3topbm: BSD defined
pi3topbm: RGB_ENV='RGBDEF'
pi3topbm: RGBENV= 'RGBDEF' (env vbl is unset)
pi3topbm -h (return code: 1)
usage: pi3topbm [-debug] [pi3file]