On Thu, 18 Jan 2001, Hal Burgiss wrote:
>
> Is the below expected behavior? or bug? Values assigned to variables
> within the loop, are not visible outside the loop. Using something
> like 'while true' works as I would expect.
>
>
> #!/bin/bash
> ## script: testing
> ## test variable visibility
>
> num=0
> echo 1 > tmp
>
> cat tmp |while read line ; do
>
> num=1
> echo $num
>
> done
>
> echo $num
>
>
> #--- eof testing
>
>
> [hal@feenix hal]$ testing
> 1
> 0
>
>
> [hal@feenix hal]$ bash -version
> GNU bash, version 2.04.11(1)-release (i386-redhat-linux-gnu)
> Copyright 1999 Free Software Foundation, Inc.
I would imagine that this is because num is resetting to 0. in the while
loop you set num = 1 then echo $num... then after done, I would imagine
that num is being reset to its original value...
just a guess...
All you did was reinitialize the variable. if you comment out the num=0
line, you get this:
[10:32:59][jlane@§î£èñßøß]$ ./foo.bar
1
(I renamed it to foo.bar)
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