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Re: Indirect expansion and arrays


From: Chet Ramey
Subject: Re: Indirect expansion and arrays
Date: Mon, 02 Aug 2010 15:25:04 -0400
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On 7/29/10 4:55 PM, Bernd Eggink wrote:
> It seems that indirect expansion doesn't work with arrays:
> 
> $ a=(x y z)
> $ b=a
> $ echo "${!b[0]} ${!b[1]} ${!b[2]}"
> x
> 
> Is that intended? The documentation isn't explicit about it.

It does, but it doesn't work in the way you are trying.  The `!' binds to
an entire variable reference, in this case 'b[0]'.  The idea behind that
was to permit the use of an array of variable names, for instance, that
could be easily referenced using indirect expansion.

The following code will display
"x variable y variable z variable"

a=(x y z)

x='x variable'
y='y variable'
z='z variable'

echo "${!a[0]} ${!a[1]} ${!a[2]}"

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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