Re: [9fans] bug in echo?

[Pietro Gagliardi <pietro10@mac.com>]

The ultimate echo, actually useful, but no one wants it.

NAME
	echo: echo arguments
SYNOPSIS
	echo [-1abCDEeilmNnOqrtuVvwXx] [-B base] [-c cmd] [-d char] [-f
file] [-L len] [-o file] [-S voice] [-s char] [args...]
DESCRIPTION
	echo outputs its arguments. It takes the following switches:

	-1		One argument per line.
	-a		Output in ASCII. The default.
	-B base	Output in given base, 2..32. Unless -u also given, base > 10
shows lowercase.
	-b		Output in binary.
	-C		Don't echo anything, just print the number of fields.
	-c cmd	Run cmd on each argument, replacing $? with the argument itself.
	-D		Output in decimal.
	-d char	Field delimiter. Default is end of argument.
	-E		Print to standard error instead of to standard output.
	-e		Allow escape sequences
	-f file	Read from file, then from command line (if any).
	-i		Read arguments from standard input.
	-L len	Line width set to len. Default is to ignore line lengths.
	-l		Turn uppercase to lowercase.
	-m		Multi-column output.
	-N		One field per line, numbering each field.
	-n		Suppress newline.
	-O		Output in octal.
	-o file	Write to file instead of standard output.
	-q		"Quiet mode:" redirect output to /dev/null if not to a file.
	-r		Print every string that matches each regular expression. Regular
expressions cannot contain + or * modifiers.
	-S voice	Send to speaker, having the given voice say it. If voice is
a null string, use the default voice.
	-s char	Separate fields with char, default space.
	-t		Separate fields with tabs.
	-u		Convert lowercase to uppercase. With -B, output in uppercase
letters for base > 10.
	-V		Strip non-printing characters.
	-v		Make non-printing characters visible.
	-w		If -l is given, word wrap instead of character wrap. Otherwise,
ignored.
	-X		Output in uppercase hexadecimal.
	-x		Output in lowercase hexadecimal.

Test for everyone: write this echo in as little code as possible. C
or rc is permitted. The rules:
	- for C: either Standard C (no other libraries) or only libc (no
other Plan 9 libraries)
	- for rc: only use programs in the core Plan 9 distribution - no
programs that I have to get myself
	- match the behavior EXACTLY as above
	- shortest code and fastest run time wins
Winner gets something cool.