[Toybox] Add remaining pwd options

[Felix Janda]

On 12/31/12 at 09:50pm, Rob Landley wrote:
> On 12/31/2012 10:39:18 AM, Felix Janda wrote:
> > On 12/30/12 at 05:47pm, Rob Landley wrote:
> > > On 12/30/2012 05:16:41 AM, Felix Janda wrote:
> > > > On 12/30/12 at 04:43am, Rob Landley wrote:
> > > > POSIX contains many surprises. In the section on environment
> > > > variables it
> > > > says that $PWD should be set if "pwd -P" was specified. What  
> > happens
> > > > if an
> > > > error happens seems unspecified.
> > 
> > Sorry, this is wrong. It has been changed between SUSV4 and SUSV3.  
> > Now pwd
> > must not change $PWD. (It would be really nice to have SUSV4 man  
> > pages...)
> 
> There are susv4 web pages which you can download and pull up with  
> "links" or similar if it really bothers you.

Having something like "man 1p pwd" is just too convenient.

> Trying to beat sane behavior out of bash is not a fruitful endeavor:
> 
>    cd
>    mkdir missing
>    cd missing
>    rmdir ../missing
>    pwd -P
>    cd ..
>    ls
>    echo $PWD
> 
> I'm not copying that behavior.

Of course, me neither. bash seems still to try to follow the older version
of POSIX, but its version of "pwd -P" seems to be broken in another way.


Do I understand correctly that in the case that pwd (as a builtin of toysh)
can't determine the path of the current working directory with getcwd() it
should fall back to printing $PWD?


BTW, in the case that one has deleted and recreated one's current working
directory one could also use "cd ." to get to the new directory.

Felix

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