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Re: qwerty


From: Chet Ramey
Subject: Re: qwerty
Date: Wed, 11 Nov 2009 21:05:49 -0500
User-agent: Thunderbird 2.0.0.23 (Macintosh/20090812)

Ken Irving wrote:

>> $ printf "%d %s\n" 1 ok -
>> 1 ok
>> -bash: printf: -: invalid number
>> 0
>>
>> why getting error here, and not in the previous?
>> why "invalid number" ?
>> what is that zero?
> 
> Again, you have more arguments than operators, so it makes another pass,
> and on the second pass tries to format - as a number...  Don't know
> about the zero, but I guess %d maybe starts with a default of 0...?

When bash detects an integer conversion error, it returns 0.  That's not
strictly Posix-conformat, so the next version of bash will return
whatever strtoimax/strtoll/strtol returns, which is supposed to be the
value accumulated up to the point of the error.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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