Shell Programming and Scripting

Hi Expert,

I want to print CPU and Memory utilization into a text file. I am using "prstat -Z" to see the output on screen. When I run below command

Code:

prstat -Z | grep httpd | awk '{print$3} '>> output.txt

but it is not printing to file. Also I want to be below header on output

Code:

PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
6809 httpd 2229M  966M sleep   59    2   0:08:34 0.1% java/67

If anyone have solution for this, I will be appreciate

Thanks in advance!
Lalit

Moderator's Comments:

How to use code tags

Presumably your example is the output from "prstat -Z" to the screen.
What do you need the output to look like?

What you you get in "output.txt" on your test?

Okay, so Lalit, a couple of issues here:

This will never work. At least never give you what you (say) you want. 'prstat' is continuous and a single pipe allows termination for the fwrite() but the second pipe will hold all output to that process. Sorry, it's the way it works. Also your awk command would never give the data line you show that you want.

A suggestion?

Code:

#!/bin/bash
trap "exit 0;" SIGINT SIGTERM
prstat -Z 1 1 | head -1 > filemon.header
cat filemon.header > filemon.out
while [ 1 ]
do
        prstat -cZ 1 20 | grep zpool > filemon.tmp
        cat filemon.tmp >> filemon.out
        clear; date; cat filemon.header
        cat filemon.tmp | tail -21
done

Naturally, replace 'zpool' with 'http' or 'httpd' and YES, I know you actually get multiple "cycles" of output per screen, have to wait 20 seconds at first, etc., but we make do with the tools we have.

Regards

dc++

Hi

Thanks for reply!

When I run this script, it creates filemon.out, filemon.header, and filemon.tmp files.
Also running continuously with header like below
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP

and no out put is coming and printing to file.

Because I am new in scripting. So there is anything else required.

Actually, My requirement is to capture the CPU and Memory utilization.
So any other option is fine or not.

Thanks
Lalit

Again, did you change "zpool" to "httpd" ???

Just a thought...

Hi

Thanks for reply
Now I am getting output in file.
But I have doubt, when I run the script then script is running and running ........not stopping and output is adding and adding.......... at end of the file.

So I have to print output 1 time only and script should break once it finish.
I am really appreciate.

Thanks!
Lalit

Lalit,

Yes, the script is indeed running exactly as I wrote it. It was an example of how to use the prstat command and get results back.

Modify it as you require.

I would think if you just wanted one set of output, you would do:

Code:

 
prstat -cZ 1 20 | grep httpd > prstat.out

and then you have the information for that interval in the file.

Good luck!

dc++