ppmtotga --version (return code: 0)
ppmtotga: Using libpbm from Netpbm Version: Netpbm 10.0
ppmtotga: BSD defined
ppmtotga: RGB_ENV='RGBDEF'
ppmtotga: RGBENV= 'RGBDEF' (env vbl is unset)
ppmtotga -h (return code: 1)
usage: ppmtotga [-name <tganame>] [-mono|-cmap|-rgb] [-norle] [ppmfile]