Runs dmesg to get the System Messages, keeps the last 20 lines of that, and produces a complete web page of that. The output includes header lines showing the date and time. The page also includes a meta tag to auto-refresh itself every five seconds.
Click here to run this script now a view the resulting page.
1 <html>
2 <head>
3 <title>Most recent 20 System Message (dmesg) lines</head>
4 <meta http-equiv="refresh" content="5" />
5 <style>
6 .grn {color:black; background-color:PaleGreen}
7 .wht {color:black; background-color:white}
8 </style>
9 </head>
10 <body>
11 <h1><center>Most recent 20 System Message (dmesg) lines</center></h1>
12
13 <?php
14 $myhost = `hostname` ;
15 echo "<h2><center><b>on host machine <i>" . $myhost . "</i></b></center></h2>\n" ;
16 echo "<p><center>Refreshing every 5 seconds (not that this output ever changes much).<br />\n" ;
17 echo "<a href=\"run-dmesg-php-list.html\">Click here</a> to view ";
18 echo "the PHP script that generates this page.</center></p>\n" ;
19 echo "<center>For a more interesting page, with messages that actually\n" ;
20 echo " change from time to time,<br />\n" ;
21 echo " take a look at the <a href=\"run-weblog.php\">web activity log</a>\n" ;
22 echo " page instead.\n" ;
23 echo "</center>\n" ;
24 echo "<h3>" . `date '+%T %A %B %-d, %Y'` . "</h3>\n" ;
25 $xx = `dmesg | tail -20` ;
26
27 // Deal with the dmesg output line-by-line, displaying the lines
28 // with alternate green and white background:
29
30 $dline = explode( "\n", $xx ) ;
31 reset( $dline ) ;
32 echo "<pre>" ;
33 $color = 0 ;
34 while ( list($dkey, $dvalue) = each($dline) ) {
35 echo '<span class="' . ( $color == 1 ? "grn" : "wht" ) . '">' . $dvalue . " </span>\n" ;
36 $color = 1 - $color ;
37 }
38 echo "</pre>" ;
39 ?>
40
41 <hr />
42 </body>
43 </html>