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<html>
<head>
<title>Using popen() to read the output of the UNIX who command</title>
</head>
<body>
<h2>Administrators currently logged on to the server</h1>
<?php
$ph = popen( "who", "r" ) or die( "Couldn't open connection to 'who' command" );
$host="www.java2java.com";
while ( ! feof( $ph ) ){
$line = fgets( $ph, 1024 );
if ( strlen( $line ) <= 1 )
continue;
$line = ereg_replace("^([a-zA-Z0-9_\-]+).*", "<a href=\"mailto:\\1@$host\">\\1</a><BR>\n",$line );
print "$line";
}
pclose( $ph );
?>
</table>
</body>
</html>
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