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Shell Programming and Scripting

Variable setting help please

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Top Forums Shell Programming and Scripting Variable setting help please
# 15  
Old 06-28-2005
Quote:
Originally Posted by r2007
I think pixelbeat is right.
In this case, most of shell folks a subshell to run the loop block.
try ksh.
I think yes.

But the whole .sh script runs in a fork'ed subshell. Since the script runs in a subshell, $L ( within the context of the script) will retain the value and echo should output it right.

Once you are out of the script, the subshell ceases to be. And hence no more $L in the parent shell.

vino
# 16  
Old 06-28-2005
Computer This works
#!/bin/sh

L=0

test()
{
while read line
do

l='expr $L + 1'
echo $L

done

echo $L
}

test < test.sh
# 17  
Old 03-25-2006
* The entire while loop runs in a subshell because of the pipe
* Variable values set inside while loop not available after while loop

A solution:

L=0

cat test.sh | { while read line
do

L='expr $1 + 1'
echo $L

done

echo $L

}

Notice the braces. They put the variables in the local subshell.
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