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Dragonmi_07 @dragonmi07

Peace✨ Malaysia Joined November 2025
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Out of Context Human Race @NoContextHumans

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Dhanian 🗯️ @e_opore

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Linux Permission System 1. Introduction → Linux uses a powerful permission model to control who can read, modify, or execute files and directories. → Ensures system security, resource isolation, and access control. → Permissions apply to users, groups, and others. 2. Permission Categories → Each file or directory has three permission sets:  → User (Owner)  → Group  → Others (Everyone else) → View permissions using:  → ls -l Example output: -rwxr-xr-- 3. Permission Types → Each permission category can have the following rights: → r (read)  → Files: view content  → Directories: list files → w (write)  → Files: edit or delete  → Directories: add or remove files → x (execute)  → Files: run as a program  → Directories: access inside the directory (cd) 4. Understanding Permission Structure → A permission string has 10 characters: [Type][User][Group][Others] → For example: drwxr-x--- → d indicates directory. → rwx user permissions. → r-x group permissions. → --- others permissions. 5. Changing File Permissions (chmod) → Modify permissions using symbolic or numeric modes. Symbolic mode: → chmod u+x file → chmod g-w file → chmod o+r file Numeric mode: → Converts r=4, w=2, x=1. Examples: → chmod 755 file → chmod 644 file → chmod 700 file 6. Changing File Ownership (chown) → Change the file owner:  → sudo chown user file → Change owner and group:  → sudo chown user:group file 7. Changing Group Ownership (chgrp) → Assign a new group:  → sudo chgrp groupname file 8. Special Permissions: SUID, SGID, Sticky Bit SUID (Set User ID) → Allows users to run a file with the owner’s privileges. → Set with:  → chmod u+s file Example: → /usr/bin/passwd uses SUID to modify /etc/shadow. SGID (Set Group ID) → New files inside a directory inherit the directory’s group. → Set with:  → chmod g+s dir Sticky Bit → Protects files from being deleted by other users inside shared directories (e.g., /tmp). → Set with:  → chmod +t dir 9. Default Permissions: umask → Defines what permissions new files receive by default. → Check umask:  → umask → Example:  → umask 022  → Default file permission will be 644. 10. File Access Control Lists (ACLs) → Used for more fine-grained permissions. → Commands:  → setfacl -m u:user:rwx file  → getfacl file → Provides access control beyond standard user/group/others model. 11. Permission Management Commands Summary → chmod — change permissions → chown — change file owner → chgrp — change file group → umask — default permissions → setfacl — extended permissions → ls -l — view file permissions 12. Security Best Practices → Avoid giving write permissions to “others”. → Use the sticky bit on shared directories. → Configure umask for secure defaults. → Use ACLs for precise access control. → Regularly audit permissions using scripts or security tools. 13. Quick tip → Linux permissions form the core of system security. → They include user, group, others, and special bits like SUID, SGID, and Sticky Bit. → Commands like chmod, chown, and setfacl allow precise control of file access. → Understanding these concepts ensures secure and stable Linux administration. Learn More About Linux Administration and Internals in This Ebook: codewithdhanian.gumroad.com/l/dynwdc

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