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Re: Bash forgets array values outside of a while loop


From: Paul Jarc
Subject: Re: Bash forgets array values outside of a while loop
Date: Tue, 20 Nov 2001 01:03:52 -0500
User-agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/20.7 (i386-redhat-linux-gnu)

Joe User <address@hidden> wrote:
>               ( for i in 0 1 2 3 4 ; do echo $i ; done ) |
>                       while read f[$fnum]; do echo "address@hidden"; 
> fnum=$(($fnum+1)); done

See FAQ entry E4.  Each element of a pipeline is run in its own
process.  (Thus your subshell for the first element is also
redundant.)

>        Almost like f has scope within the while loop.

The scope is the pipeline element.  This will show the value set in
the loop:
... | { while read blah; do foo; done; echo $blah; }


paul



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