Linux File Permissions & chmod Command Explained | Symbolic and Numeric Mode | Practical Examples
In this video, you will learn Linux file permissions and the chmod command with simple explanations and practical examples.
The chmod command is used to change file and directory permissions in Linux. This video explains read, write, and execute permissions using both symbolic mode and numeric (octal) mode.
Topics covered:
• What are Linux file permissions?
• Read (r), Write (w), and Execute (x) permissions
• User (u), Group (g), and Others (o)
• Understanding ls -l permission output
• chmod command syntax
• Symbolic mode permissions
• Numeric / Octal mode permissions
• chmod 777 explained
• chmod 755 explained
• chmod 644 explained
• Add and remove permissions
• Change file permissions
• Change directory permissions
• Practical Linux examples
• Real-time production support use cases
Example commands covered:
ls -l
chmod 777 file.txt
chmod 755 script.sh
chmod 644 file.txt
chmod u+x script.sh
chmod u+r file.txt
chmod g+w file.txt
chmod o-r file.txt
chmod a+x script.sh
chmod -R 755 mydirectory
Permission values explained:
• Read (r) = 4
• Write (w) = 2
• Execute (x) = 1
Common permission examples:
• 777 = rwxrwxrwx
• 755 = rwxr-xr-x
• 644 = rw-r--r--
• 700 = rwx------
This tutorial is useful for beginners, students, Linux administrators, system administrators, production support engineers, application support engineers, DevOps engineers, cloud engineers, and anyone preparing for Linux interviews.
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