CmdID / Commands
rasttopnm
Convert a Sun rasterfile to a PNM file. tldr-pages
On several platforms
Convert a RAST image to a PNM file
rasttopnm path/to/input.rast >path/to/output.pnmIdentify
Use the color map indices in the raster if they are color values
rasttopnm -index path/to/input.rast >path/to/output.pnmIdentify