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Process monitor script?

Hey guys.

My question is pretty simple. I've got a script here that will monitor hard drive usage. Once it gets to 90% i get a snmp alarm. My next project is to monitor CPU usage. With my hard drive script i use df -a to get my hard drive usage in a perl script. Is there any command that will output how much CPU usage is currently being used. Any help is greatly appreciated.

Thanks.

-Moa

I guess i posted a little bit early. top -b -n 1 works to get output. Any suggestions how i add up the total in the CPU line ( in perl ).

Thanks again,

Moa

To make things a little bit more clear. This is my Script to send the trap after it checks the hda %. I imagine it only needs to be altered just a little bit to get this to work. I just need to add up the %CPU usage column then send if it's above a certain %....

Code:

#!/usr/bin/perl



$above = 11;



use FileHandle;

use BER '0.58';

use SNMP_Session '0.58';

use SNMP_util "0.54";



@check=`df /dev/hda1`;



##### Checks for lines higher than $above

foreach (@check) {

        if (m/(\d+\%)/ and $1 >=$above) {

                push @New,$_;

        }

}



##### If there is anything found, send trap

if (@New) {

        snmptrap("public\@10.64.15.202:162", ".1.2.3.2.1.127.1.0", "localhost", 6, 1,".1.2.3.2.1.127.1.0", "string", "Disk Space Reached $above% full on @New\n!");



}

This one works just fine. Any suggestions on checking CPU usage?