Sub shell mit pipes

[Morard Jean-Louis]

Dear all,

I think there is a problem whith the bash shell, at least in the version 2.05b on RedHat EL 3. Here is my script (just a test for demonstration purposes):

#!/bin/bash

ALL=""
cat /tmp/text | while read LINE
do
        ALL="$LINE $ALL"
        echo $ALL
done
echo "ALL = $ALL"

The output is the following:
a
b a
c b a
d c b a
e d c b a
f e d c b a
g f e d c b a
ALL =

The behaviour could be considered as correct if we think about sub shells and so on... But it causes problems with portability from a standard ksh script on solaris. And it's not quite nice if we think that the following works correctly:

#!/bin/bash

ALL=""
cat /tmp/text | while read LINE
do
        ALL="$LINE $ALL"
        echo $ALL
done < /tmp/text
echo "ALL = $ALL"

The output is the following:
a
b a
c b a
d c b a
e d c b a
f e d c b a
g f e d c b a
ALL = g f e d c b a

Is there any environment variable to set so that it works correctly?

Thanks for your help!
Jean-Louis

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Jean-Louis Morard
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