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From: Pietro Gagliardi <pietro10@mac.com>
Date: Thu,  3 Apr 2008 15:44:52 -0400
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] bug in echo?
Topicbox-Message-UUID: 87dcf16e-ead3-11e9-9d60-3106f5b1d025

Ah good one.

The order of interpretation is:

	-f
	-i
	command line

On Apr 3, 2008, at 3:30 PM, Steven D. Vormwald wrote:

> Pietro Gagliardi wrote:
>> 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.
>
> What should it do if you mix -f and -i?
>