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return1=`/path/to/script.pl arg1 arg2`
return2=$(/path/to/script.pl arg1 arg2)

return_newlines="$(/path/to/script.pl arg1 arg2)"

#!/usr/bin/perl
print $_, $/ for @ARGV;

#!/bin/bash
value=0
...
        echo "value is $value"
done <<<"$(./script.pl arg1 arg2)"
echo "finally, value is $value"

value starts from 0
value is arg1
...
value is arg1
value is arg2
finally, value is arg2