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