Day 6 - File Permissions and Access Control Lists

➡File Permissions

1. Create a simple file and do ls -ltr to see the details of the files

Each of the three permissions are assigned to three defined categories of users. The categories are:

1. owner — The owner of the file or application.

   "chown" is used to change the ownership permission of a file or directory.

1. group — The group that owns the file or application.

   "chgrp" is used to change the group permission of a file or directory.

1. others — All users with access to the system. (outised the users are in a group)

   "chmod" is used to change the other users permissions of a file or directory.

➡Access Control Lists(ACL) in Linux

What is ACL ?
Access control list (ACL) provides an additional, more flexible permission mechanism for file systems. It is designed to assist with UNIX file permissions. ACL allows you to give permissions for any user or group to any disc resource.

Use of ACL :
Think of a scenario in which a particular user is not a member of group created by you but still you want to give some read or write access, how can you do it without making user a member of group, here comes in picture Access Control Lists, ACL helps us to do this trick.

setfacl and getfacl are used for setting up ACL and showing ACL respectively.

getfacl file1.txt

setfacl -m u:UserA:rwx file1.txt

Thanks for taking the time to read! 😊