ilbmtoppm --version (return code: 0)
ilbmtoppm: Using libpbm from Netpbm Version: Netpbm 10.0
ilbmtoppm: BSD defined
ilbmtoppm: RGB_ENV='RGBDEF'
ilbmtoppm: RGBENV= 'RGBDEF' (env vbl is unset)
ilbmtoppm -h (return code: 1)
usage: ilbmtoppm [-verbose] [-ignore <chunkID> [-ignore <chunkID>] ...] [-isham|-isehb|-isdeep|-isnotham|-isnotehb|-isnotdeep] [-cmaponly] [-adjustcolors] [-transparent <color>] [-maskfile <filename>] [ilbmfile]