Book Image

Linux Shell Scripting Essentials

By : Sinny Kumari, Khem Raj
Book Image

Linux Shell Scripting Essentials

By: Sinny Kumari, Khem Raj

Overview of this book

Table of Contents (15 chapters)
Linux Shell Scripting Essentials
About the Author
About the Reviewers

Listing and monitoring processes

In a running system, we often notice that suddenly a system is responding slowly. This can be because a running application is consuming a lot of memory or a process is doing CPU-intensive work. It's hard to predict which application is causing the system to respond slower. To know the reason, it is good to know what all processes are running and also know the monitoring behavior (such as the amount of CPU or memory being consumed) of processes.

Listing processes

To know a list of processes running in the system, we can use the ps command.


The syntax of the ps command is as follows:

ps [option]

There are a lot of options to use the ps command. The commonly used options are explained in the following table.

Simple process selection

The following table shows the multiple options that can be clubbed together and used to get a better selection of results:



-A, -e

Selects all processes


Selects all processes that don't fulfill a condition...