`pwd' returns a dot

[ziyunfei]

$ cd /
$ PWD=. bash -c pwd
.
$ PWD=. ksh -c pwd
/

Posix says that pwd shouldn't return the filenames dot or dot-dot.
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pwd.html

RE: `pwd' returns a dot

[Le Manh Cuong]

When variable PWD changed, the behavior of pwd is unspecified 
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pwd.html#tag_20_97_08

-- Mr. LE Manh CuongMobile: +84 1216 181090Skype: manhcuongle> From: 
446240...@qq.com
> Subject: `pwd' returns a dot
> Date: Wed, 16 Sep 2015 15:51:08 +0800
> To: bug-bash@gnu.org
> 
> $ cd /
> $ PWD=. bash -c pwd
> .
> $ PWD=. ksh -c pwd
> /
> 
> Posix says that pwd shouldn't return the filenames dot or dot-dot.
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pwd.html
> 
  

Re: `pwd' returns a dot

[Stephane Chazelas]

2015-09-16 15:51:08 +0800, ziyunfei:
> $ cd /
> $ PWD=. bash -c pwd
> .
> $ PWD=. ksh -c pwd
> /
> 
> Posix says that pwd shouldn't return the filenames dot or dot-dot.
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pwd.html

Also:

$ cd /
$ PWD=bin/.. bash -c 'pwd; cd ..; pwd'
bin/..
..

Note that POSIX is now explicit in how $PWD from the environment
should be handled:

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_05_03

-- 
Stephane

Re: `pwd' returns a dot

[Chet Ramey]

On 9/16/15 3:51 AM, ziyunfei wrote:
> $ cd /
> $ PWD=. bash -c pwd
> .
> $ PWD=. ksh -c pwd
> /
> 
> Posix says that pwd shouldn't return the filenames dot or dot-dot.
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pwd.html

Thanks for the report.  I'll take a look.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRUc...@case.eduhttp://cnswww.cns.cwru.edu/~chet/

SHLVL is a random string (uninitialized string in C) when its true value is "1000"

[ziyunfei]

$ SHLVL=998 bash -c 'echo $SHLVL'
999
$ SHLVL=999 bash -c 'echo $SHLVL'

$ SHLVL=999 bash -c 'echo -n "$SHLVL" | hexdump'
0b 01
$ SHLVL=999 bash -c 'echo -n "$SHLVL" | hexdump'
0f 01
$ SHLVL=999 bash -c 'echo -n "$SHLVL" | hexdump'
04 01
$ SHLVL=1000 bash -c 'echo $SHLVL'
bash: warning: shell level (1001) too high, resetting to 1
1

null ptr deref & segfault in multiple versions of bash

[Brian Carpenter]

<<$(()())|>_[$($(<<0)) triggers a null ptr deref and segfault in multiple
versions of bash

https://savannah.gnu.org/support/index.php?108884