I recently worked on a project involving many bash scripts, and I've been
trying to use errexit to stop various parts of a script as soon as anything
returns a non-0 return code. As it turns out, this is an utterly useless
endeavour. In asking this question on this forum, I hope somebody out the
On Friday, December 14, 2012 6:23:41 PM UTC-5, Eric Blake wrote:
> Short answer: historical compatibility. 'set -e' has been specified to
> behave the way it did 30 years ago in one reference implementation, and
> while you can argue till you are blue in the face that the reference
> implementatio
On Saturday, December 15, 2012 5:23:04 PM UTC-5, Chet Ramey wrote:
> There is already a proposal for a new option similar to what you want; you
> can read the discussion at
>
> http://austingroupbugs.net/view.php?id=537
Thank you for all the references, I'll have a look!
With the script below, I'd expect any fd pointing to /dev/null to be closed
when the second llfd() is executed. Surprisingly, fd 3 is closed, but fd 10 is
now open, pointing to /dev/null, as if eval copied it instead of closing it. Is
this a bug?
Thanks,
M
$ bash -c 'llfd () { ls -l /proc/$BA
Ok, but I see the same behaviour when eval runs in a subshell:
$ bash -c 'llfd () { echo "pid:$BASHPID" >&2; ls -l /proc/$BASHPID/fd/ >&2;
}; x=3; eval "exec $x>/dev/null"; llfd; echo | eval "llfd $x>&-"'
[same output, fd 10 open, pointing to /dev/null, even though it's a
subshell]
$ bash -c 'llf
hy would I want the fd in a variable
otherwise.)
Too bad the "natural" syntax 'llfd $x>&-' doesn't work, but I guess this
will do.
On Tue, Feb 12, 2013 at 11:12 AM, Greg Wooledge wrote:
> On Tue, Feb 12, 2013 at 11:07:06AM -0500, Matei David wrote:
> > On a d
hich are not copied across subshells; like 60&63
3. fds which are copied across subshells, but not exec; like 10
I knew about types 1&2, but not about type 3. Apparently with your first
suggestion, fd 10 is created and survives a subshell creation. Is this
correct??
On Tue, Feb 12, 20
o on this subject.
Thanks,
M
On Tue, Feb 12, 2013 at 2:50 PM, Chet Ramey wrote:
> On 2/12/13 2:07 PM, Matei David wrote:
>
> > ... there seem to be not 2 but 3(!) types of file descriptors:
> > 1. fds which are copied across both subshells and exec; like 4
> > 2. fds wh
Thank you for the explanation.
On Tue, Feb 12, 2013 at 8:32 PM, Chet Ramey wrote:
> On 2/12/13 11:40 AM, Pierre Gaston wrote:
> > On Tue, Feb 12, 2013 at 6:07 PM, Matei David
> wrote:
> >
> >> Ok, but I see the same behaviour when eval runs in a subshell:
> >
2:28 8 -> /proc/4520/auxv
cat: /dev/fd/63: No such file or directory
$
Note how 63 is open before '(echo)' and closed after. Is this expected?
On Wed, Feb 13, 2013 at 12:06 PM, Matei David wrote:
> Thank you for the explanation.
>
>
> On Tue, Feb 12, 2013 at 8:32 PM, Ch
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