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Top Forums Shell Programming and Scripting Help with Shell script that monitors CPU Usage Post 303028222 by mhannor on Wednesday 2nd of January 2019 09:07:41 AM
Old 01-02-2019
Help with Shell script that monitors CPU Usage

I'm a newbie to shell scripting, I was given this script to modify. This script that monitors when CPU Usage is too high based off the top command. The comparison is not working as it should. Its comparing a decimal to a regualar interger. When it send me an email, it send an email and ignores the if statement. I receive an email if its below or above 90. I only need an email if its greater than 90. I use
Code:
 while :; do :; done

to run CPU up to 100%. and then test running the below script. Can you all please assist me in what I'm doing incorrectly here:

Code:
#!/bin/ksh
top -b -n 1 |head -8 >/tmp/cpu.text
sed -e '1,5d' /tmp/cpu.text >/tmp/cpu2.text
High_CPU=`cat /tmp/cpu2.text|tail -1|awk '{print $9}'`
host=`hostname`
if [ "$High_CPU -gt  90" ];
then
mail -s "High CPU USAGE on $host" test@test.comv < /tmp/cpu2.lst
fi
exit;

 

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IWATCH(1)						      General Commands Manual							 IWATCH(1)

NAME
iwatch - a realtime filesystem monitor / monitor any changes in directories/files specified SYNOPSIS
iwatch [options] DESCRIPTION
This manual page documents briefly the iwatch command. iWatch is a realtime filesystem monitoring program. It's a simple perl script to monitor changes in specific directories/files and send email notification immediately. It reads the dir/file list from xml config file and needs inotify support in kernel (Linux Kernel >= 2.6.13). OPTIONS
Usage for daemon mode of iWatch: iwatch [-d] [-f <config file>] [-v] [-p <pid file>] In the daemon mode iWatch has the following options: -d Execute the application as daemon. iWatch will run in foregroud without this option. -f <configfile.xml> Specify alternative configuration file. Default is /etc/iwatch/iwatch.xml. -p <pidfile> Specify an alternate pid file (default: /var/run/iwatch.pid) -v Be verbose. Usage for command line mode of iWatch: iwatch [-c command] [-e event[,event[,..]]] [-h|--help] [-m <email address>] [-r] [-s <on|off>] [-t <filter string>] [-v] [--version] [-x exception] [-X <regex string as exception>] <target> In the command line mode iWatch has the following options: -c <command> You can specify a command to be executed if an event occurs. For details about the string format take a look at /usr/share/doc/iwatch/README.gz. -C <charset> Specify the charset (default is utf-8). -e <event[,event[,..]]> Events list. For details about possible events take a look at /usr/share/doc/iwatch/README.gz. -h, --help Print help message. -m <emailaddress> Contact point's email address. Without this option, iwatch will not send any email notification (obviously). -r Recursivity of the watched directory. -s on|off Enable or disable reports to the syslog (default is off/disabled). -t <filter> Filter string (regex) to compare with the filename or directory name. -x <exception file or directory> Specify the file or directory which should not be watched. -X <regex string as exception> Specify a regex string as exception. USAGE EXAMPLES
% iwatch /tmp Monitor changes in /tmp directory with default events. % iwatch -r -e access,create -m root@localhost -x /etc/mail /etc Monitor only access and create events in /etc directory recursively with /etc/mail as exception and send email notification to cahya@localhost. % iwatch -r -c (w;ps -ef)|mail -s '%f was changed' root@localhost /bin Monitor /bin directory recursively and execute the command. % iwatch -r -X '.svn' ~/projects Monitor ~/projects directory recursively, but exclude any .svn directories inside. This can't be done with a normal '-x' option since '-x' can only exclude the defined path. AUTHOR
iwatch was written by Cahya Wirawan <cahya@gmx.at>. This manual page was written by Michael Prokop <mika@debian.org> for the Debian project (but may be used by others). IWATCH(1)
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