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Essential Linux Commands

You're reading from   Essential Linux Commands 100 Linux commands every system administrator should know

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Product type Paperback
Published in Nov 2023
Publisher Packt
ISBN-13 9781803239033
Length 250 pages
Edition 1st Edition
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Author (1):
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Paul Olushile Paul Olushile
Author Profile Icon Paul Olushile
Paul Olushile
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Table of Contents (20) Chapters Close

Preface 1. Part 1:Server Installations and Management Commands
2. Chapter 1: Getting a CentOS Server Up and Running FREE CHAPTER 3. Chapter 2: Linux User and Group Commands 4. Chapter 3: File Compression and Archival Commands 5. Part 2:Frequently Used Commands – Part 1
6. Chapter 4: Format and Disk Space Commands 7. Chapter 5: Linux Permissions Commands 8. Chapter 6: Filesystem Mount and Manipulation Commands 9. Part 3:Frequently Used Commands – Part 2
10. Chapter 7: File Content and Conversion Commands 11. Chapter 8: Linux SWAP Commands 12. Chapter 9: Linux Monitoring and Debugging Commands 13. Chapter 10: Linux IPTABLES and Network Commands 14. Chapter 11: File Transfer, Downloading, and Managing Log Files 15. Part 4:Linux Security and the Cloud
16. Chapter 12: Exploring Linux Security 17. Chapter 13: Linux in the Cloud 18. Index 19. Other Books You May Enjoy

Files, directories, and permission commands

Files and directories are organized in a hierarchical structure, with the root directory as the top-most level. Each file and directory has a set of permissions that determine who can read, write, or execute it. The file permissions are divided into three categories—user, group, and others:

  • user: This refers to the owner of the file
  • group: This refers to a group of users assigned to the file (e.g., developers)
  • others: This refers to anyone else who is not the owner or part of the assigned group

Let’s take a look at the hierarchical structure:

Figure 2.14 – Linux files and directory hierarchical structure

Figure 2.14 – Linux files and directory hierarchical structure

To manage file and directory permissions in Linux, there are several command line tools available. Some of the commonly used commands include chmod, chown, and chgrp.

chmod

The chmod command is used to change the permissions of a file or directory. To recursively...

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