/usr/bin/unihexgen - generate unifont.hex code points as
four-digit hexadecimal numbers in a 2 by 2 grid,
or six-digit hexadecimal numbers in a 3 by 2 grid.
Syntax:

     /usr/bin/unihexgen first_code_point last_code_point > glyphs.hex

Example (to generate glyphs for the Private Use Area):

     /usr/bin/unihexgen e000 f8ff > pua.hex