If no files are given, grotty will read the standard input. A filename of - will also cause grotty to read the standard input.
Output is written to the standard output.
The font description file may contain a command internalname n where n is a decimal integer. The code field in the font description field gives the code which will be used to output the character. Use horizontal tabs in the output. Tabs are assumed to be set every 8 columns. Use form feeds in the output.