value of variable hasn't changed after while loop

[w3]

Hi,


Why can't I change the value of variable after while loop?

#!/bin/sh

A="cde"
cat /etc/passwd | while read line; do
  A="abc" && echo $A
done

echo $A

bash-2.05$ ./test.sh
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
cde <-- The value of $A hasn't been changed!

Is it a bash bug?

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