* jobs
@ 2016-12-21 12:34 Jan Stary
2016-12-21 13:08 ` jobs Harald van Dijk
0 siblings, 1 reply; 3+ messages in thread
From: Jan Stary @ 2016-12-21 12:34 UTC (permalink / raw)
To: dash
Hello,
trying to keep my shell scripts portable,
I am also testing on systems which use dash;
for instance, /bin/sh is dash in Ubuntu.
That's where my scripts fail because of
how the "jobs" builtin behaves.
First of all, "jobs" is not even mentioned in
http://git.kernel.org/cgit/utils/dash/dash.git/tree/src/dash.1
Some basic functionality seems to be broken.
Start three background jobs:
$ md5sum < /dev/random &
$ md5sum < /dev/random &
$ md5sum < /dev/random &
What jobs am I running?
$ jobs
[3] + Running md5sum 0</dev/random
[2] - Running md5sum 0</dev/random
[1] Running md5sum 0</dev/random
Good. How many is that?
$ jobs | wc -l
0
Zero. Hm.
$ jobs
[3] + Running md5sum 0</dev/random
[2] - Running md5sum 0</dev/random
[1] Running md5sum 0</dev/random
No, wait, it's three. Let's kill them:
$ kill `jobs -p`
dash: 10: kill: Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]...
kill -l [exitstatus]
What's the pid list again?
$ jobs -p
30783
30782
30780
Is this intended? The behaviour descibed above can't be right.
Does the pipe or the `...` run in it's own shell (which indeed has no jobs)?
In that case, I can circumvent this with a temporary file, as in
$ jobs > /tmp/jobs
$ wc -l < /tmp/jobs
but doing that instead of a pipe seems backward at best.
Jan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: jobs
2016-12-21 12:34 jobs Jan Stary
@ 2016-12-21 13:08 ` Harald van Dijk
0 siblings, 0 replies; 3+ messages in thread
From: Harald van Dijk @ 2016-12-21 13:08 UTC (permalink / raw)
To: Jan Stary, dash
Hello,
On 21/12/2016 13:34, Jan Stary wrote:
> Hello,
>
> trying to keep my shell scripts portable,
> I am also testing on systems which use dash;
> for instance, /bin/sh is dash in Ubuntu.
> That's where my scripts fail because of
> how the "jobs" builtin behaves.
>
> First of all, "jobs" is not even mentioned in
> http://git.kernel.org/cgit/utils/dash/dash.git/tree/src/dash.1
Indeed, it's a built-in command, so it would make sense to document it
along with the other built-in commands.
> Some basic functionality seems to be broken.
> Start three background jobs:
>
> $ md5sum < /dev/random &
> $ md5sum < /dev/random &
> $ md5sum < /dev/random &
>
> What jobs am I running?
>
> $ jobs
> [3] + Running md5sum 0</dev/random
> [2] - Running md5sum 0</dev/random
> [1] Running md5sum 0</dev/random
>
> Good. How many is that?
>
> $ jobs | wc -l
> 0
This is discussed in <https://www.spinics.net/lists/dash/msg01161.html>.
It's certainly not desired behaviour and equally certainly not what
POSIX intends, given that POSIX gives examples involving $(jobs -p).
Arguably though, it may be what POSIX requires, and even if not, it's
not clear exactly what POSIX does require. I offered to try to come up
with a patch to make it behave more sensibly if there was a reasonable
chance it would be accepted, but the dash maintainer (Herbert Xu) hasn't
commented on this yet. Hoping to hear his ideas on what should work and
what shouldn't.
A slightly less bad workaround than redirecting to a temporary file
might be to save each PID in a variable immediately after creating the
background process, using $!.
Cheers,
Harald van Dijk
^ permalink raw reply [flat|nested] 3+ messages in thread
* jobs
@ 2010-07-22 20:37 Sage Weil
0 siblings, 0 replies; 3+ messages in thread
From: Sage Weil @ 2010-07-22 20:37 UTC (permalink / raw)
To: ceph-devel
Hi all,
Just a quick note that we have some job openings for those interested in
getting paid to work on Ceph. The main one we're trying to fill now is a
QA person. We are also always looking for qualified developers, both for
the server side (C/C++) and kernel side.
http://ceph.newdream.net/jobs
sage
^ permalink raw reply [flat|nested] 3+ messages in thread
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