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Re: variable name and its' value are the same characters causes recursio


From: Eric Blake
Subject: Re: variable name and its' value are the same characters causes recursion error
Date: Wed, 09 Mar 2011 15:03:31 -0700
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On 03/09/2011 02:54 PM, Chet Ramey wrote:
>>
>> For example:
>>
>> unset a; declare a="a"; [[ a -lt 3 ]]; echo $?
>> bash: [[: a: expression recursion level exceeded (error token is "a")
>> 1
>>
>> Shouldn't the return code from this expression be 2, rather than 1?
> 
> What does it matter?  Failure is failure.

Except that [[ explicitly documents that 0 and 1 imply a syntactically
valid expression, reserving $?==2 for catastrophic failure.  The
argument here is that infinite recursion is catastrophic and represents
an invalid expression, and should not be confused with $?==1 meaning a
valid but false expression.  Similarly to expr(1) returning 0 and 1
depending on value for success, and > 1 on failure.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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