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Re: bug when 'cd ..' to a directory who's parent has been deleted


From: Dave Rutherford
Subject: Re: bug when 'cd ..' to a directory who's parent has been deleted
Date: Mon, 8 Feb 2016 11:44:51 -0500



On Mon, Feb 8, 2016 at 11:34 AM, Linda Walsh <address@hidden> wrote:
> Chet Ramey wrote:
>> On 2/8/16 9:59 AM, Andreas Schwab wrote:
>>> Chet Ramey <address@hidden> writes:
>>>> `cd ..' should fail, since the parent no longer exists, and the pathname
>>>> canonicalization should fail, since there's presumably no longer a valid
>>>> path to reach the current directory.  No value for $PWD is correct.
>>> ${PWD%/*} would be a reasonable value.  FWIW, this is what ksh uses in
>>> this case, it doesn't fail.
>> Why would that be more reasonable than anything else?  It references a
>> path that doesn't exist.
> Um...Not exactly.  As long as there's a handle open to the previous path,
> it still exists (at least on linux and unix).

Really?
11:40:24 address@hidden:~$ mkdir -p a/a
11:40:30 address@hidden:~$ cd a/a
[remove a in another window]
11:40:49 address@hidden:~/a/a$ touch file
touch: cannot touch ‘file’: No such file or directory

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