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Re: [PATCH] Adding support for '--' in builtin echo's option parsing.

From: Eric Blake
Subject: Re: [PATCH] Adding support for '--' in builtin echo's option parsing.
Date: Mon, 01 Apr 2013 13:49:41 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4

On 04/01/2013 01:32 PM, Dave Rutherford wrote:
> On Mon, Apr 01, 2013 at 03:16:07PM +0300, Hemmo Nieminen wrote:
>>> Description:
>>>         Currently it seems to be impossible to e.g. print "-n" with the 
>>> builtin
>>>         echo witout any extra characters.
>> You should use printf instead.  The echo command is a historical artifact
>> which cannot be used for general-purpose output.
>> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html says:
>>     The echo utility shall not recognize the "--" argument in the manner
>>     specified by Guideline 10 of XBD Utility Syntax Guidelines ; "--"
>>     shall be recognized as a string operand.
> Perhaps this is worth adjusting unless POSIXLY_CORRECT?

No.  Existing scripts already rely on existing behavior, and changing
the behavior of 'echo' is just asking for problems.  Use 'printf' instead.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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