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Re: Waiting for _any_ background process to terminate.


From: Chet Ramey
Subject: Re: Waiting for _any_ background process to terminate.
Date: Mon, 11 Feb 2013 15:05:25 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130107 Thunderbird/17.0.2

On 2/11/13 1:59 PM, Alan Mackenzie wrote:
> Hi, bug-bash.
> 
> From a bash script, I'd like to be able to start several subtasks and
> react to any one of them completing.  I don't think I can do this with
> the current bash.  The `wait' function either waits on a specified subtask
> to finish, or for _all_ subtasks to finish.
> 
> Am I mistaken about this perceived lack?  If not, would it be possible
> to add this functionality into bash?

Right now, you have to build your own using a SIGCHLD trap.  The next
version of bash will have `wait -n', which will wait for the next process
to change state.

Chet

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



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