Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Help with Shell script that monitors CPU Usage

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Help with Shell script that monitors CPU Usage
# 8  
Old 01-02-2019
Quote:
Originally Posted by mhannor
High_CPU is always a decimal from the top command. Does that help?
ksh doesn't have floating arithmetic, but you can overcome this multiple ways.
Either converting to int, doing math in say awk or using bc for comparison
and many other ways....
This User Gave Thanks to vgersh99 For This Post:
nezabudka
# 9  
Old 01-02-2019
Code:
if [ "${High_CPU%,*}" -gt  90 ]

# 10  
Old 01-02-2019
Quote:
Originally Posted by nezabudka
Code:
if [ "${High_CPU%,*}" -gt  90 ]

or by declaring High_CPU as an int:
Code:
typeset -i High_CPU

And doing the comparison the old way
This User Gave Thanks to vgersh99 For This Post:
nezabudka
# 11  
Old 01-02-2019
This is what I received when I did
Code:
if [ "${High_CPU%,*}" -gt  90 ]

Code:
[dbtlst@asdv-snsc-tlst ~]$ sh cputest.sh
+ top -b -n 1
+ head -8
+ sed -e 1,5d /tmp/cpu.lst
++ tail -1
++ cat /tmp/cpu2.lst
++ awk '{print $9}'
+ High_CPU=21.1
++ hostname
+ host=fakehostname.com
+ '[' 21.1 -gt 90 ']'
cputest.sh: line 8: [: 21.1: integer expression expected

and this is what I received when I did typeset -i High_CPU

Code:
+ top -b -n 1
+ head -8
+ sed -e 1,5d /tmp/cpu.lst
+ typeset -i High_CPU
++ cat /tmp/cpu2.lst
++ tail -1
++ awk '{print $9}'
+ High_CPU=16.7
cputest.sh: line 6: 16.7: syntax error: invalid arithmetic operator (error token is ".7")
++ hostname
+ host=fakehostname.com
+ '[' '' -gt 90 ']'
cputest.sh: line 8: [: : integer expression expected
+ exit

# 12  
Old 01-02-2019
What OS are you on?
Instead of running the script as sh cputest.sh, make the script executable (chmod +x cputest.sh) and rerun it with ./cputest.sh.
Share the outcome.

Also... "${High_CPU%,*}" where High_CPU has a value of 21.1 - where , is not .
# 13  
Old 01-02-2019
Redhat Linux 7, and IT WORKS, that was the issue, why did that cause an error?

--- Post updated at 03:43 PM ---

Thanks so much, I been trying to figure this out for a week! I'm so grateful to you all.
# 14  
Old 01-02-2019
Quote:
Originally Posted by mhannor
Redhat Linux 7, and IT WORKS, that was the issue, why did that cause an error?

--- Post updated at 03:43 PM ---

Thanks so much, I been trying to figure this out for a week! I'm so grateful to you all.
Both approaches worked?
If you run the script with sh cputest.sh, the content of the script is pasted to whatever shell interpreter you run it with on cli - in your cash it's sh (which might or might not be the same as /bin/ksh that you have on the first line of your script).
If you make the script executable and run it with ./cputest.sh, the specific interpreter to be used is taken from the script itself and it's /bin/ksh.
The bottom line is: your sh might or might not be the same as /bin/ksh
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help with speeding up my working script to take less time - how to use more CPU usage for a script

Hello experts, we have input files with 700K lines each (one generated for every hour). and we need to convert them as below and move them to another directory once. Sample INPUT:- # cat test1 1559205600000,8474,NormalizedPortInfo,PctDiscards,0.0,Interface,BG-CTA-AX1.test.com,Vl111... (7 Replies)
Discussion started by: prvnrk
7 Replies

2. Shell Programming and Scripting

Script for CPU usage -Linux

Hi all I was wondering if its possible to write a script to keep CPU usage at 90%-95%? for a single cpu linux server? I have a perl script I run on servers with multple cpu's and all I do is max all but one cpu to get into the 90'% utilised area. I now need a script that raises the CPU to... (4 Replies)
Discussion started by: sudobash
4 Replies

3. Shell Programming and Scripting

CPU usage script

Hello Friends, I am trying to create a shell script which will check the CPU utilization. I use command top to check the %CPU usage. It give s me below output Cpu states: CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS 0 0.31 9.6% 0.0% 6.1% 84.3% 0.0% 0.0%... (3 Replies)
Discussion started by: Nakul_sh
3 Replies

4. Shell Programming and Scripting

Shell script to calculate the max cpu usage from the main script

Hi All, I have a script which does report the cpu usuage, there are few output parameter/fields displayed from the script. My problem is I have monitor the output and decide which cpu number (column 2) has maximum value (column 6). Since the output is displayed/updated every seconds, it's very... (1 Reply)
Discussion started by: Optimus81
1 Replies

5. Shell Programming and Scripting

Shell script for logging cpu and memory usage of a Linux process

I am looking for a way to log and graphically display cpu and RAM usage of linux processes over time. Since I couldn't find a simple tool to so (I tried zabbix and munin but installation failed) I started writing a shell script to do so The script file parses the output of top command through... (2 Replies)
Discussion started by: andy_dufresne
2 Replies

6. HP-UX

Perl script limit cpu usage

Hi Experts, I am executing multiple instances(in parallel) of perl script on HP-UX box. OS is allocating substantial amount of CPU to these perl processes,resulting higher cpu utilization. Glance always shows perl processes are occupying majority of the CPU resource. It is causing slower... (2 Replies)
Discussion started by: sai_2507
2 Replies

7. Shell Programming and Scripting

shell script to alert cpu memory and disk usage help please

Hi all can any one help me to script monitoring CPU load avg when reaches threshold value and disk usage if it exceeds some % tried using awk but when df -h out put is in two different lines awk doesnt work for the particular output in two different line ( output for df -h is in two... (7 Replies)
Discussion started by: robo
7 Replies

8. Shell Programming and Scripting

Help with bash script - Need to get CPU usage as a percentage

I'm writing a bash script to log some selections from a sensors output (core temp, mb temp, etc.) and I would also like to have the current cpu usage as a percentage. I have no idea how to go about getting it in a form that a bash script can use. For example, I would simply look in the output of... (3 Replies)
Discussion started by: graysky
3 Replies

9. AIX

How to monitor the IBM AIX server for I/O usage,memory usage,CPU usage,network..?

How to monitor the IBM AIX server for I/O usage, memory usage, CPU usage, network usage, storage usage? (3 Replies)
Discussion started by: laknar
3 Replies

10. HP-UX

how can I find cpu usage memory usage swap usage and logical volume usage

how can I find cpu usage memory usage swap usage and I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times my final destination is monitor process logical volume usage above X % and number of Logical voluage above can I not to... (3 Replies)
Discussion started by: alert0919
3 Replies
Login or Register to Ask a Question