Access Control List (ACL)

Introduction

• Limitations of standard Linux permissions
  • Limited to owner, group, and everyone else
  • Lack of specific user grants

Situation 1: Special Permissions for the President

• Read-only permissions granted to the group
• Guest permissions granted

Commands and Options

• ACL command: -l
• Special flags: Capital X
  • Selective execute permission

Default Permissions

• For regular files and directories
  • Read-write for new files
  • Read for directories

Example: Rohit and Reliance Group

• Rohit: Owner, read-write permissions
• Reliance Group: Read-only permissions
• Members: Virat and Sourabh
  • Virat: Read permission and content read

Specific Case: Restricting Virat from Files

• Remove permission with setfacl command
• Verify: With getfacl command

Project Example: Group Commander

• Ram: Read-write permissions
• Shyam: Write in new practice set

Summary

• Use of ACL to set specific user and group permissions
• Overcome large traditional limitations

Next Topic

• Advanced editing and policies
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