Hi, this is Sandra Henry-Stocker, author of the “Unix as a Second Language” blog on NetworkWorld.
In this Linux tip, we’re going to look at the ps command that displays information on running processes.
If you type nothing but ps, you will only see the processes that you are running in your current session.
I’m using bash (my shell) and using the ps command.
If I want to see all of the running processes, I can use the command ps -ef.
Notice that we see more fields too: userid, process ID, parent process ID, start time (or date), the tty being used, accumulated CPU time and the command itself.
If I want to see only certain processes, you can pass the output of a ps command to grep and specify what you want to see – for example, by username or process name.
You can also count the number of running processes.
That’s your Linux tip for the ps command.
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