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ps Usage

ps(1) can be used to check on active processes on the system.

The command below lists all processes and useful information:

$ ps -aux

This can be useful to see if a daemon or process is running. For example, if you used rcctl? to stop the web server, double check to ensure it has actually stopped with ps(1) and grep(1), or pgrep(1):

$ pgrep httpd

If all httpd processes have been stopped, you should see no output. If you see a number representing a process ID, see the guides on killing processes.