Re: Probably very stupid script/bash question

[Brian <Brian_dorling@t-online.de>]

Mark Clarkson wrote:
> On Tue, 04 Mar 2008 18:46:05 +0100
> Brian <Brian_dorling@t-online.de> wrote:
>
> > I could not get this to work, the shell complains:
> >
> > ./dirvish-mail.sh: 98: Syntax error: redirection unexpected
>
> Interesting to note that this does not work under busybox. I think
> this is rather an esoteric but often useful bash feature. (It also
> needs /proc so is not available in some special cases.)
>
> > The other solution from Alex:
> >
> >  >> echo "$teststring" | ( read A B C D E F; )
> >
> > Of course, both solutions work perfectly under bash.
>
> This should not have worked under bash either since it is still running
> in a sub-shell, so the variables are lost when read finishes.
Mark,
of course you are correct. I had written the following test script:

=================================================================
#!/bin/bash 



teststring="one two three four five six" 



{ read A B C D E F; } < <( echo "$teststring" ) 

echo "Data received = $E Bytes" 





echo "$teststring" | ( read A B C D E F; ) 

echo "Data received = $E Bytes"
=================================================================

$E was still set from the first read call. Duuh.

So can you explain exactly what the first < <( echo "$teststring" )
does exactly please?


Cheers Brian