pgmtexture --version (return code: 0)
pgmtexture: Using libpbm from Netpbm Version: Netpbm 10.0
pgmtexture: BSD defined
pgmtexture: RGB_ENV='RGBDEF'
pgmtexture: RGBENV= 'RGBDEF' (env vbl is unset)
pgmtexture -h (return code: 1)
usage: pgmtexture [-d <d>] [pgmfile]