How do I capture the top output of a file?
However, besides real time viewing of the running system, top command output can be saved to a file, by using the -b flag, which instructs top to operate in batch mode and -n flag to specify the amount of iteration the command should output.
How do I see CPU usage at top?
4 Answers
- Run 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.
How to print the output of a top command?
To print top output for only one process, use the following command: $ top –p PID To save top command of any process to a file, use the following command: top -p $PROCESS_ID -b > top.log
How to save top command output to a file?
To grab five iteration of top command, execute the command as shown in the below excerpt. $ top -b -n 5 > top-5iterations.txt In order to display only the number of running tasks from the resulted file, use the grep filter, as shown in the below command example. $ cat top-5iterations.txt | grep Tasks
How to dump top output to a file?
You can use below command which dumps top output to a file: As pointed out by @Thor in a comment, you just need to ensure that grep is not buffering arbitrarily but per-line with the –line-buffered option: Without grep-ing, redirecting the output of top to a file works just fine, interrupt included. I had the exact same problem…
How to get the PID of a cron process?
To get the PID of a running process, issue pidof command against the name of the running process. In this example we’ll monitor the cron process via top command by taking three snapshots of the PID. Using a for iteration loop, we can display a process statistics via its PID, each two seconds, as shown in the below example.