char *usage_opts[] = {
	"  -1: don't alternate colors for normal characters.",
	"  -b: bold color output.",
	"  -c nnnnn: colors (2 to 5 digits, 0 to 7).",
	"  -d data: dump this data instead of a file.",
	"  -h, --help: print this help message.",
	"  -i: print number of bytes/chars/ascii/multibyte/bad sequences.",
	"  -j: java (MUTF-8) mode: allow 0xc0 0x80 for U+0000.",
	"  -l length: stop dumping after <length> bytes (not characters).",
	"  -m: monochrome mode.",
	"  -n: ignore UXD_OPTS environment variable.",
	"  -o offset: added to hex offsets (decimal, 0x hex, 0 octal).",
	"  -r: don't highlight multi-byte chars in reverse video.",
	"  -s pos: seek in input before dumping (-pos = seek back from EOF).",
	"  -S pos: like -s, but also sets -o so addresses start at 0.",
	"  -t: put terminal in utf-8 mode.",
	"  -T: put terminal in utf-8 mode, and leave it that way on exit.",
	"  -u: uppercase hex digits.",
	"  -v, --version: print version of uxd.",
	"  -w: WTF-8 mode (allow surrogates).",
	(char *)0
};