How To Capture Username/User ID who Upload the Files

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Linux

PHP

Hi All,

I work in Linux shell script.

I want to capture username/user id the person who upload the files.

This is my trial but failed..

<?php
session_start();
$_SESSION['views'] = 1; // store session data
//echo "Pageviews = ". $_SESSION['views']; //retrieve data

echo "$USER"

?>