pnmsmooth --version (return code: 0)
pnmsmooth: Using libpbm from Netpbm Version: Netpbm 10.0
pnmsmooth: BSD defined
pnmsmooth: RGB_ENV='RGBDEF'
pnmsmooth: RGBENV= 'RGBDEF' (env vbl is unset)
pnmsmooth -h (return code: 1)
usage: pnmsmooth [-size width height] [-dump dumpfile] [pnmfile]