For total CPU usage:
If you ONLY want the CPU Usage in general you might try this:
top -b -d1 -n1|grep -i "Cpu(s)"|head -c21|cut -d ' ' -f3|cut -d '%' -f1 > file1.csv
This will give you only the CPU value an update the one in the file. If you want to APPENDE the data to the file since I see you are naming it a csv file then instead of one > use two, like
For each thread and CPU usage:
First you need to eliminate the rest of the columns so it be easier to get the CPU data.
top and press f.
- In this menu you select which columns you want to see and which you do not. For your case leave only the CPU column and name (if you want the name)
- Press ESC to go back to the main Top menu and save with Capital W the change. Now you command is easier to parse.
Now for general CPU usage you normally have other tools like
iostat an doing a
cat /proc/stat. For each you need a different parse like the one used for top. I only posted here for TOP since you explicitly mention it in the title.
NOTE: Should be noted tath top is not the most efficient way to see the CPU usage or to work with when parsing values for it.