redirect awk information to stdout

Question

I am trying to gather information for CPU use for all the processors in a text file.

mpstat -P ALL -u 1 | awk '{print $4}' > cpu.txt

&&

mptat -P ALL -u 1 | awk '{print $4}' | tee cpu.txt

Neither of them seems to work when piped.

Any suggestions to get this working.

Much appreciated.

Answer 1

Try the following:

while true; do
    mpstat -P ALL | awk '{print $4}' >> cpu.txt
    sleep 1
done

Control-C to stop when you have enough data.