Shell Programming and Scripting

1. I setup a website on html with a single text box and a submit button.
2. When the user enters the data into the text box and clicks submit - The output is displayed on a php site I setup as well

*Clearly I don't know much of PHP or HTML*

So now, I want to.... take this output, convert it into variable $IP_ADDRESS, send this variable to an outside script and then output the generated data on the same php site.

This is what I have so far.

==

Code:

<?php
$IP_ADDRESS = $_POST['IP_ADDRESS'];


if( empty($IP_ADDRESS )) {
echo "<h2>Enter some data</h2>\n" ;
die ("Click Back to start again.");
}

echo "Output:<br><br>";
echo $IP_ADDRESS;
?>

//It works up to here

Code:

<?php
system('bash ./cnamegenerate.sh', $IP_ADDRESS);
?>

===

Code:

[root]$ cat cnamegenerate.sh 
echo $IP_ADDRESS;

Code:

$ cat cnamegenerate.sh
 
if [[ ! -z ${1} ]]; then
   IP_ADDRESS="${1}"
else
   echo -e "Usage:\n\t${0} <IP_ADDRESS>"
   exit 1
fi
 
echo ${IP_ADDRESS}

For the PHP
Also make sure that the WebServer User (generally apache or any other) should have execute permission on the above shell script.