accessing ps pid number

crash4o4

Hello there, I was wondering on how to access a pid number of a ps aux |grep query I make.

like what would be better to use.

exec()
system()
passthru()

$ps = exec('ps aux |grep app',$store);

basically I want to grep a ip address cause the application is running spawn on different ip's which is on the same box. normally I would just ps aux |grep ipaddress

see the pid number and kill -9 the two pid's it is running on. make changes than start it backup.

Any tip's or if someone could point me into the right direction thanks.

drew010

[man]preg_match[/man] could do the job.

crash4o4

thanks for the response. I was looking in my book and also at the link you posted. I don't know how that would help me. This is basically the output I get from this code.

<?
echo "<pre>";
$ps = system("ps aux|grep 24.34.125.252",$return);
echo $ps;

echo "</pre>";

?>

netcrown 16843  0.0 10.5 64712 54452 ?       S    23:50   0:00 ./hlds_i686 -game cstrike +ip 24.34.125.252 -port 27015 +maxplayers 20 +map de_dust2
netcrown 16844  0.0 10.5 64712 54452 ?       R    23:50   0:00 ./hlds_i686 -game cstrike +ip 24.34.125.252 -port 27015 +maxplay

so now I would just want to extract the pid number 16843 and 16844 so that I could issue the next command which would be kill -9.

with preg_match() I'm stuck on how I would do that.

drew010

$ps = system("ps aux|grep 24.34.125.252",$return); 

preg_match_all('/^[\S]+ (\d+)/m', $ps, $matches);

foreach($matches[1] as $pid) {
	`kill -SIGTERM $pid`;
}

crash4o4

thanks drew I'll give that a try 🙂

Weedpacket

Seeing as ps uses fixed width columns (I think...what happens to a really long process name? Doesn't really matter I suppose: use some formatting options to specify your own ordering!😉) substr() could also locate the appropriate part of the line.

crash4o4

Weedpacket wrote:
Seeing as the formatting used fixed width columns (I think...what happens to a really long process name?) substr() could also locate the appropriate part of the line.

yeah I was just reading around on the php manual, and it suggested that. Basically the code above doesn't seem to work. I might just write something in python or perl and than make php access it.

drew010

did it not kill them or not find the process ids. maybe you dont have permission to kill them? either run it as root or make a php app that will run as the username of the process.

crash4o4

thanks weedpacket this looks much easier to use.

<?php
echo substr('abcdef', 1); // bcdef
echo substr('abcdef', 1, 3); // bcd
?>

I'll see if I can come up with something and I'll post my results so that if someone else is trying to do the same thing as I am.

crash4o4

crash4o4 wrote:
yeah I was just reading around on the php manual, and it suggested that. Basically the code above doesn't seem to work. I might just write something in python or perl and than make php access it.

what I did was open ssh and run it from command line and it kept giving me this error.


netcrown 17815  0.0  0.1  5452  924 pts/1    R+   03:57   0:00 sh -c ps aux|grep 24.34.125.252
sh: line 0: kill: (17815) - No such process

but I did end up coming up with code that did the trick


<pre>
<?
 $ps = system("ps aux|grep 24.34.125.252"); 

$pid = substr($ps,8,6);

echo $pid;
?>
</pre>

this returned only the process id.

drew010

when you run ps it does include itself since it is a running process at the time of listing them. the only reason i used preg_match_all is because if there are more than 1 of them running it gets every one, and the lengths and digits can change. the process id probably wont always be 5 digits long. might go to 4 but probably not 3. the regular expression will grab it no matter how many digits it is.