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