Issue
I'm trying to produce an output with the top 3 processes by CPU usage produced by the top command, over the last 10 seconds. I can see what I want by launching top in interactive modem, the output of this will update every 10 seconds:
top -o +%CPU -d 10
I can send this result to the sed command through a pipeline, which will give me one reading of the result I want:
top -o +%CPU -d 10 | sed -n '11q;7,10p'
After the timespan specified with the -d flag then the command will resolve and exit. How can I specify that I want the command to be run again and a new output to be produced when the timespan is completed?
WHAT DO I EXPECT: usually the interactive mode of the top command updates its value after a certain timespan has passed, similarly I expect the "cutout" to be updated. In other words, I expect several readings to be produced instead of just one.
Solution
This might work for you (GNU watch, top & sed):
watch -tn10 "LINES=10 top -wbn1 -o +%CPU | sed '1,6d'"
Watch the composed command every 10 seconds.
Answered By - potong
