Check task cpu usage from shell script ?

pcatiprodotnet

From a shell script, is there a way to determine if the current CPU usage of a specified task is over 30%, then perform an action?
Thanks!

pcatiprodotnet

What shell script language(s) does pfSense Embedded version have built in?
Where may I find the best Cheat Sheet and Manual for it?
Thank you, -pc

sullrich

pfSense has
tcsh
and normal sh

Check the online FreeBSD man pages.

sullrich

Okay, took a moment to figure this out. Thanks to Bill M for the integer idea.

Here's the deal, we have no utilities in the current installs to calculate long integers from the shell so I modified the snapshot server and future versions to include the bc utility.

Anyhoo, in an hour install the latest snapshot then test this script:

#!/bin/sh
PROGS_TO_TEST_FOR="make top ls script screen cvs cvsup"
for processing in $PROGS_TO_TEST_FOR; do
        CPUUSAGE=`ps awux | grep $processing | awk '{ print $3 }' | tail -n1`
        CPUUSAGEB=`echo 100 \* $CPUUSAGE | bc`
        echo $CPUUSAGEB
        if [ $CPUUSAGEB -gt 30 ]; then
                echo "$processing is using more than 30"
        fi
done

pcatiprodotnet

Thank you, S.Ullrich & Bill.M! I'll try that script next time we re-flash.

I haven't yet managed to locate the "sh" manual on freebsd.org; nothing so far on search engines either, "sh" is a nondistinctive term.
Thanks, -pc

sullrich

Here's an updated version.

#!/bin/sh
PROGS_TO_TEST_FOR="make top ls script screen cvs cvsup"
for processing in $PROGS_TO_TEST_FOR; do
        CPUUSAGE=`ps awux | grep $processing | grep -v grep | awk '{ print $3 }' | tail -n1`
        CPUUSAGEB=`echo 100 \* $CPUUSAGE | bc`
        RUNNINGCMD=`ps awux | grep $processing | grep -v grep | awk '{ print $11 }' | tail -n1`
        PID=`ps awux | grep $processing | grep -v grep | awk '{ print $2 }' | tail -n1`
        if [ $CPUUSAGEB -gt 30 ]; then
                echo "$PID $RUNNINGCMD using more than 30 cpu. restarting"
                kill $PID
                exec $RUNNINGCMD
        fi
done