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From: "Dr. Yuan Liu" <yliu@stemnet.nf.ca.remove_this>
Subject: Re: NON-trivial regular expression problem (could not find on google)
Date: Sun, 19 Jan 2003 19:26:56 GMT	[thread overview]
Message-ID: <3E2AFD60.4090405@stemnet.nf.ca.remove_this> (raw)
In-Reply-To: wul1iban.fsf@online.no

Peter J. Acklam wrote:
> democrat@india.com (Instant Democracy) wrote:
>>The task is to eliminate patterns such as 
>>    DIRNAME/../
>>from the path because they are redundant.
> 
> Are they really?  If DIRNAME is a symlink, then there is no
> guarantee that these two point to the same place:
> 
>    foo/bar/..
>    foo
> 
> You *must* ensure that DIRNAME is not a symlink before you
> simplify the pathnames like this.

This seems to depend on the shell.  Only C-ish shells will turn symlinks 
into real path and cause a problem.  Bournish and Kornish shells all 
stick with the symbolic path, i.e., foo/bar/.. is always foo.

Yuan Liu

  reply	other threads:[~2003-01-19 19:26 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-01-18 20:19 NON-trivial regular expression problem (could not find on google) Instant Democracy
2003-01-18 21:38 ` Harry Putnam
2003-01-18 21:46 ` Kai Großjohann
2003-01-18 22:52 ` AW
2003-01-18 23:03 ` Edi Weitz
2003-01-19  0:27 ` Larry Clapp
2003-01-19  0:36 ` Dr. Yuan Liu
2003-01-19  0:53 ` John W. Krahn
2003-01-19  1:05 ` William Park
2003-01-19 12:17 ` Peter J. Acklam
2003-01-19 19:26   ` Dr. Yuan Liu [this message]
2003-01-20  9:15     ` Peter J. Acklam
2003-01-24 18:56       ` Yuan Liu
2003-01-24 11:20 ` Bruce Barnett

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