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Executing UNIX command from PHP script

How can I execute a UNIX command from a PHP script?

Is there someway of doing the following:

PHP Code:




<?php 
     echo "<HTML>"; 
     echo "<TITLE>"; 
     echo "<BODY>"; 
     echo `uname -a`;         <=== How do you execute this? 
     echo "</TITLE>"; 
     echo "</BODY>"; 
     echo "</HTML>"; 
?>

Nevermind, I figured it out.

This is what I am using.

http://us3.php.net/manual/en/function.system.php

But I do have another question, how can I set the PATH for commands?

For example,

If I run "php -f test.php"

PHP Code:




<?php 
echo '<pre>'; 
 
// Outputs all the result of shellcommand "ls", and returns 
// the last output line into $last_line. Stores the return value 
// of the shell command in $retval. 
$last_line = system('ls', $retval); 
 
// Printing additional info 
echo ' 
</pre> 
<hr />Last line of the output: ' . $last_line . ' 
<hr />Return value: ' . $retval; 
?>

the result is:
sh: /usr/local/php/bin/ls: No such file or directory