usage: hd [-abh] [-n OFFSET] [-r RADIX] [-w WIDTH] [--help] FILES
-a          Don't display ASCII dump
-b          Don't display binary file offset
-h, --help  Display this help
-n SIZE     Number of bytes to read
-r RADIX    Number base (default: 16)
-w WIDTH    Number of columns for output

SIZE        An unsigned integer or a percentage (e.g., 50%)
RADIX       One of: 8, 10, 16