wp writes the parameters to a file. If no filename is given, parameters are written to the file a.dat. Mode should be a (for append) or w (for overwrite). The default mode is w.
Examples:
wp writes the parameters to the file a.dat, overwriting
the file if it exists.
wp params.dat a writes the parameters to the file params.dat, appending then on to the end of the file if it already exists.