How do I get an output from Linux Top in Batch Mode on every iteration?

Question

I'm trying to log CPU and Memory stats into a file by using top on an Arch Linux. I'm just interested in one specific process and get the wanted parameters as shown below:

top -b -n1 -p 310 | tail -fn 1 | awk '{printf "%s,%s,%s,%s\n",$1,$12,$9,$10}'

This gives me an output to command line like:

310,name,0.0,10.5

So now, if I want to run this command like 10 times with a delay of 1s and write the output to a logfile I use:

top -b -n10 -p 310 -d 1 | tail -fn 1 | awk '{printf "%s,%s,%s,%s\n",$1,$12,$9,$10}' >> log.txt

But, instead printing me line by line to the logfile, I only get the last output. So my logfile contains only 1 line, although top must have been executed 10 times.

What am I doing wrong here?

PS: Printing to command line instead into a logfile produces only 1 line (the last output) as well...

Raghuram · Accepted Answer · 2013-12-10 10:52:40Z

1

The problem is because of tail command you use. Try something like this

top -p 310-b -n2 -d 1 | grep -w 310 | awk '{printf "%s,%s,%s,%s\n",$1,$12,$9,$10}'

I use grep -w to filter the lines only containing the info you are interested

answered Dec 10, 2013 at 10:52

Raghuram

3,9672 gold badges21 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How do I get an output from Linux Top in Batch Mode on every iteration?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related