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You're reading from Learning Linux Shell Scripting Unleash the power of shell scripts to solve real-world problems by breaking through the practice of writing tedious code

Product type Paperback

Published in Dec 2015

Publisher

ISBN-13 9781785286216

Length 306 pages

Edition 1st Edition

Tools

Ubuntu Server

Concepts

Shell Scripting

Author (1):

Ganesh Sanjiv Naik

Preface

1. Getting Started and Working with Shell Scripting FREE CHAPTER

2. Drilling Deep into Process Management, Job Control, and Automation

3. Using Text Processing and Filters in Your Scripts

4. Working with Commands

5. Exploring Expressions and Variables

6. Neat Tricks with Shell Scripting

7. Performing Arithmetic Operations in Shell Scripts

8. Automating Decision Making in Scripts

9. Working with Functions

10. Using Advanced Functionality in Scripts

11. System Startup and Customizing a Linux System

12. Pattern Matching and Regular Expressions with sed and awk

Index

We have used the command ps in the introduction. Let's learn more about it:

To list the process associated with our current Bash shell terminal, enter the following command:
```
$ ps
```
To list processes along with the parent process ID associated with the current terminal, enter the following command:
```
$ ps –f
```
We can see the process ID in the PID column and the parent process ID in the PPID column in the preceding output.
To list processes with the parent process ID along with the process state, enter the following command:
```
$ ps –lf
```
In the preceding output, the column with S (state) shows the current state of a process, such as R for running and S for suspended state.
To list all the processes running in the operating system including system processes, enter the following command:
```
$ ps –ef
```
The process names in [] are kernel threads. If you are interested in more options to learn about the ps command, you can use the following command:
```
$ man ps.
```
To find a particular process...