It’s not possible to get the value of the loop variables in some versions of ksh.
Example:
#!/bin/ksh
num=0
cat $0 | while read line ; do
let num=num+1
done
echo "Number=$num"
num=0
cat $0 | while read line ; do
let num=num+1
done
echo "Number=$num"
This script will return “Number=0″ as the result on some Linux machines.
Here is the workaround for the problem: You should change the redirection method for the input file.
#!/bin/ksh
l=0
while read line ; do
let l=l+1
done < $0
echo "Number=$l"
l=0
while read line ; do
let l=l+1
done < $0
echo "Number=$l"
The last script will return the correct result: “Number=9″
