Re: cd"": Shouldn't it fail?

[Chet Ramey]

On 1/28/24 10:34 AM, Kerin Millar wrote:
> On Sun, 28 Jan 2024 18:09:24 +0300
> Oğuz <oguzismailuysal@gmail.com> wrote:
>
> > On Sun, Jan 28, 2024 at 5:10 PM <jwo@jwo.cz> wrote:
> > > POSIX Programmer's Manual (cd(1p) manpage) says this:
> > >
> > >        [9 unrelated special cases]
> > >
> > >        10. The cd utility shall then perform actions equivalent to the
> > >             chdir() function called with curpath as the path argument. If
> > >             these actions fail for any reason, the cd utility shall
> > >             display an appropriate error message and the remainder of
> > >             this step shall not be executed. [...]
> >
> > Right before that, it says in 8.c:
> > > If, as a result of this canonicalization, the curpath variable is null, no 
> > > further steps shall be taken.
> >
> > which is what happens in bash, busybox sh, dash, mksh, pdksh, oksh,
> > yash, zsh, and NetBSD sh.
>
> I'm not sure that this is accurate. In my testing, bash does not even perform this 
> canonicalization step, which is optional to begin with. That is, it states that "an 
> implementation may" canonicalize in the manner described, and prescribes a course of 
> action to take if - and only if - such canonicalization is performed.

It does. Try `cd /usr/////////bin' and see what ends up in $PWD.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

OpenPGP_signature.asc
Description: OpenPGP digital signature