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Learn Linux Quickly

You're reading from   Learn Linux Quickly A beginner-friendly guide to getting up and running with the world's most powerful operating system

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Product type Paperback
Published in Aug 2020
Publisher Packt
ISBN-13 9781800566002
Length 338 pages
Edition 1st Edition
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Author (1):
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Ahmed AlKabary Ahmed AlKabary
Author Profile Icon Ahmed AlKabary
Ahmed AlKabary
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Table of Contents (24) Chapters Close

Preface 1. Your First Keystrokes 2. Climbing the Tree FREE CHAPTER 3. Meet the Editors 4. Copying, Moving, and Deleting Files 5. Read Your Manuals! 6. Hard versus Soft Links 7. Who Is Root? 8. Controlling the Population 9. Piping and I/O Redirection 10. Analyzing and Manipulating Files 11. Let's Play Find and Seek 12. You Got a Package 13. Kill the Process 14. The Power of Sudo 15. What's Wrong with the Network? 16. Bash Scripting Is Fun 17. You Need a Cron Job 18. Archiving and Compressing Files 19. Create Your Own Commands 20. Everyone Needs Disk Space 21. echo "Goodbye My Friend" 22. Assessments 23. Other Books You May Enjoy

Parent process versus child process

A parent process is a process that has started one or more child processes. A perfect example will be your terminal and your bash shell; when you open your terminal, your bash shell is started as well.

To get the PID of a process, you can use the pgrep command followed by the process name:

pgrep process_name

For example, to get the PID of your terminal process, you can run:

elliot@ubuntu-linux:~$ pgrep terminal 
10009

The PID of my terminal is 10009. Now, let's get the PID of the bash process:

elliot@ubuntu-linux:~$ pgrep bash 
10093

The PID of my bash shell is 10093. Now, you can get the information of your bash process by using the -p option followed by the bash PID:

elliot@ubuntu-linux:~$ ps -fp 10093
UID PID PPID C STIME TTY TIME CMD
elliot 10093 10009 0 13:37 pts/1 00:00:00 bash

You can see from the output that the PPID of my bash process is equal to the PID of my terminal process. This proves that the terminal process has started...

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