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Re: Process Substitution backgrounds the command list?


From: Chet Ramey
Subject: Re: Process Substitution backgrounds the command list?
Date: Thu, 13 Sep 2007 22:15:51 -0400
User-agent: Thunderbird 2.0.0.6 (Macintosh/20070728)

Bob Proulx wrote:
> I am confused by the order of operations of this following:
> 
>   $ { echo hello world | tee >(md5sum 1>&2) ;} ; echo goodbye
>   hello world
>   goodbye
>   $ 6f5902ac237024bdd0c176cb93063dc4  -
> 
> Shouldn't bash wait for the subprocess finish before the next command
> is invoked?  I did not expect the >(list) to continue to run in the
> background after the entire pipeline returned.
> 
> Is there a way to explicitly wait for that process in order to
> synchronize subsequent operations?

No, there's no way to wait for it.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                       Live Strong.  No day but today.
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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