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Re: Is this intended behavior??


From: Chet Ramey
Subject: Re: Is this intended behavior??
Date: Wed, 13 Feb 2013 12:01:18 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130107 Thunderbird/17.0.2

On 2/11/13 2:25 PM, Bruce Korb wrote:
>> /tmp
>> $ echo "$PS1"
>> \w\n\$ 
>> /tmp
>> $ mkdir -p ZZ/a/b/c
>> /tmp
>> $ pushd ZZ
>> /tmp/ZZ /tmp
>> /tmp/ZZ
>> $ pushd a
>> /tmp/ZZ/a /tmp/ZZ /tmp
>> /tmp/ZZ/a
>> $ pushd b/c
>> /tmp/ZZ/a/b/c /tmp/ZZ/a /tmp/ZZ /tmp
>> /tmp/ZZ/a/b/c
>> $ popd /var/tmp
>> /tmp/ZZ/a/b/c /tmp/ZZ/a /tmp/ZZ
>> /tmp/ZZ/a/b/c
>> $ popd /var/tmp
>> /tmp/ZZ/a/b/c /tmp/ZZ/a
>> /tmp/ZZ/a/b/c
>> $ 
> 
> It is behaving as if it were seeing the "-0" option.

It's unspecified behavior.  popd doesn't take any `non-option' arguments.
As soon as you specify one, you can't really expect to know what will
happen without experimentation or reading the source.

/var/tmp gets translated to the equivalent of -0 (if you're curious, it's
because `/' isn't `+' and the default directory index is 0).

It should probably be an error instead.

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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