Subject: Re: [ast-users] Question about output of jobs -ln command
--------
> Hi,
>
> ksh version: sh (AT&T Research) 93t+ 2009-05-01
> OS: Red Hat Enterprise Linux AS release 4 (Nahant Update 5)
>
> I am doing some work that requires tracking background jobs in a shell.
> I earlier versions of ksh the command "jobs -ln" would print out the process
> id(s) of the job(s) that had ended, so I would parse the output
> and in a for loop to pass the process id(s) to wait, to check the exit
> status.
>
> But in this release I have found that "jobs -ln" does not include the
> process id.
>
> Cut down example of what I mean:
>
> set -o monitor
>
> trap checkbg CHLD
>
> function checkbg
> {
>
> jobs -ln
> }
>
> sleep 10 &
>
> wait
>
> exit 0
>
> This prints out;
> "[1] + Done <command unknown>"
>
> Is this correct or is there something else I have to do to get the process
> id from the jobs command?
>
> Is there a better way to check the exist status from a bunch of background
> jobs in a script?
>
> Thanks
>
> Pete
>
With the version in beta, (soon to be released), you can use
the following, to wait for background jobs and to get their
exit status.
For example, the following script:
==============cut here=====================
trap 'print pid=$! completed with exit status=$?' CHLD
for (( i= 0; i < 10; i++))
do { r=$((1+(RANDOM%8))); sleep $r; exit $r;} &
done
wait
==============cut here=====================
produce the output
pid=188346 completed with exit status=2
pid=188351 completed with exit status=2
pid=188349 completed with exit status=3
pid=188347 completed with exit status=4
pid=188345 completed with exit status=6
pid=188353 completed with exit status=6
pid=188344 completed with exit status=6
pid=188350 completed with exit status=6
pid=188352 completed with exit status=7
pid=188348 completed with exit status=8
David Korn
[email protected]
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