#!/bin/bash
value=0
echo "value starts from $value"
./script.pl arg1 arg2 | while read line ; do
   value=$line
        echo "value is $value"
done
echo "after first while, value is $value"
 
while read line ; do
   value=$line
        echo "value is $value"
done <<<"$(./script.pl arg1 arg2)"
echo "finally, value is $value"