pbmupc --version (return code: 0)
pbmupc: Using libpbm from Netpbm Version: Netpbm 10.0
pbmupc: BSD defined
pbmupc: RGB_ENV='RGBDEF'
pbmupc: RGBENV= 'RGBDEF' (env vbl is unset)
pbmupc -h (return code: 1)
usage: pbmupc [-s1|-s2] <type> <manufac> <product>