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Thanks.

Wonderful solution!

hi
Thanks for your help. I've made the modifications but still does not work:

code:
[#!/bin/sh
set -x

for shell_args in "$@"
do
stype=` awk '{print substr ("'"$shell_args"'", 0, 3)}' `...

Not sure why it is not working the following :

set -- $@
stype ="a"
for shell_args in "$@"
do
$stype=` awk '{print substr ("'"$shell_args"'", 0, 3)}' `
echo $stype
done

Thank you