VSZ (virtual set size) shows the
size of the image process (in kilobytes), and RSS (resident set size) shows the size of the program
in memory. START shows the time the process began running, and TIME shows the cumulative system
time used. (Many commands consume very little CPU time, as reflected by 0:00 for processes
that haven??™t even used a whole second of CPU time.)
Many processes running on a computer are not associated with a terminal. A normal Linux system
has many processes running in the background. Background system processes perform such tasks
as logging system activity or listening for data coming in from the network. They are often started
when Linux boots up and run continuously until it shuts down. To page through all the processes
running on your Linux system, add the pipe (|) and the less command to ps aux, like this:
$ ps aux | less
A pipe (above the backslash character on the keyboard) enables you to direct the output of one
command to be the input of the next command. In this example, the output of the ps command (a
list of processes) is directed to the less command, which lets you page through that information.
Use the spacebar to page through, and type q to end the list. You can also use the arrow keys to
move one line at a time through the output.
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