PHP Language - CAT / GREP / Tail

Author

CAT / GREP / Tail

TomT

2005-02-23, 8:55 am

Hi..

can anyone point to a site that can offer advice on creating a web
page that will allow me to view a live log file and the run cat, grep,
tail from a web page on that file !!

Thanks

Colin McKinnon

2005-02-23, 3:55 pm

TomT wrote:

> Hi..
>
> can anyone point to a site that can offer advice on creating a web
> page that will allow me to view a live log file and the run cat, grep,
> tail from a web page on that file !!
>
> Thanks

HTTP is a stateless protocol so you can only get a 'snapshot' of the file.
You can use javscript to keep updating that snapshot or deliver another
program (maybe a java applet) which uses a different protocol to get the
data.

HTH

C.

TomT

2005-02-23, 3:55 pm

any pointers of where to look for some info ??

Thanks

On Wed, 23 Feb 2005 15:33:23 +0000, Colin McKinnon
<colin.deletethis@andthis.mms3.com> wrote:

>TomT wrote:
>
>
>HTTP is a stateless protocol so you can only get a 'snapshot' of the file.
>You can use javscript to keep updating that snapshot or deliver another
>program (maybe a java applet) which uses a different protocol to get the
>data.
>
>HTH
>
>C.

Dave Patton

2005-02-23, 3:55 pm

TomT <tomt@adslweb.co.uk> wrote in
news:94mo11lpnsi0kv3enpqmsjdavm5dqsroj3@
4ax.com:

> Hi..
>
> can anyone point to a site that can offer advice on creating a web
> page that will allow me to view a live log file and the run cat, grep,
> tail from a web page on that file !!

http://www.php.net/manual/en/function.exec.php

For example:
$tailval = 20;
$logroot = '/var/logs';
$file = 'access_log';
$command = "tail -{$tailval} {$log_root}/$file";
print("<pre>");
unset($output);
$result = exec( $command, $output, $retval );
print("{$command}<br>");
print("Status: {$retval}<br>");
foreach($output as $outputline)
{
print("$outputline<br>");
}
print("</pre>");

--
Dave Patton
Canadian Coordinator, Degree Confluence Project
http://www.confluence.org/
My website: http://members.shaw.ca/davepatton/

Senator Jay Billington Bulworth

2005-02-27, 3:56 pm

Colin McKinnon <colin.deletethis@andthis.mms3.com> wrote in
news:cvi7nk$crr$1$830fa79d@news.demon.co.uk:

> TomT wrote:
>
a web[color=darkred]
cat,[color=darkred]
>
> HTTP is a stateless protocol so you can only get a 'snapshot'
of the
> file. You can use javscript to keep updating that snapshot or
deliver
> another program (maybe a java applet) which uses a different
protocol
> to get the data.
>
> HTH
>
> C.

It's possible to emulate the function of "tail -f" via PHP. It
isn't likely to work in safe mode, so shared hosting
environments might not be a great place to run it, but here's
some "tail -f" code. The larger you set $lines and the smaller
you set $sleep, the more strain this will put on a server.

<?php
set_time_limit(60);

$file = '/var/log/httpd/access_log';
$sleep = 1;
$lines = 100;

echo '<pre>';
$command = 'tail -' . (int)$lines . " \"$file\"";
$newtail = $oldtail = array();
while(1){
$tail = '';

$fp = popen($command, 'r') or die("Unable to run command:
$command");
while(!feof($fp)){
$tail .= fread($fp, 4096);
if(feof($fp)){
break;
}
}
pclose($fp);

$newtail = explode("\n", trim(rtrim($tail)));

for($i=0; $i<count($newtail); $i++){
if(in_array($newtail[$i], $oldtail)){
continue;
}
echo "$newtail[$i]\n";
}

$oldtail = $newtail;
flush();
sleep($sleep);
}
?>

hth

--

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