How to get CPU usage from "top" and save it to file - MAC OS bash

Question

I am using the terminal in MAC OS. I want to get on only the total ideal CPU from the top command (just ideal cpu) and stor it to a file.

I have tried this: top | grep -w "CPU usage: " And i got this :

/Test/temp1 » top | grep "CPU usage: "                                                130 ↵
CPU usage: 5.45% user, 11.77% sys, 82.77% idle 
CPU usage: 3.20% user, 3.51% sys, 93.27% idle 
CPU usage: 2.64% user, 2.76% sys, 94.59% idle 
CPU usage: 3.18% user, 2.61% sys, 94.19% idle

.

I want to store only the last metrics en every line which is "82.77% idle" but without the "% and idel" word, only I want the amount of ideal CPU to store it in a file. Ex:

I appreciate your help ,,,

You could pipe grep's output to sed 's/.*\s$[0-9.]*$%.*/\1/' — builder-7000
– builder-7000, Commented May 21, 2019 at 17:48

Charles Duffy · Accepted Answer · 2019-05-21 19:36:33Z

1

You can use a combination of grep and awk to get the required number alone. Here the --line-buffered flag is used, which forces grep to write to the output each time a new line is encountered.

top | grep --line-buffered "CPU usage: " |awk '{ print substr($5, 1, length($5)-1) }'

Or you could directly use awk

top | awk '/^CPU usage: / { print substr($5, 1, length($5)-1) }'

edited May 21, 2019 at 19:36

Charles Duffy

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answered May 21, 2019 at 17:42

BlackPearl

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1 Comment

Charles Duffy Over a year ago

grep is never needed when you're piping to awk. awk '/CPU usage: / { print substr($5, 1, length($5)-1) }'

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