Linux File Permissions Using ACL

Have you ever wondered what wouldn't be great if you created a file, worked on it and allowed a selected to have access to it? You would say, it's possible if we create a group and add those users to a group. But if I say there's no need to create a group you can do it directly through the ACL command. Today in this blog I am going to show you how you can do this very easily !

First, you need to install ACL on your Linux system.
Now we are going to use the getfacl and setfacl commands.
With the gatfacl command, you can view the permissions of a particular file or directory systematically.
Now let's use the setfacl command.
First of all, we have to create a directory. new
Redirect yourself to the usr directory. Now create a new directory, I would name it tmpops. Enter into the directory and create a file hello.txt
Now first of all when you created a directory, you had to use sudo permissions to do that. So first change the group user and the owner of the .txt file to your default user for me. By default, the user is ubuntu.

Now to give your user privileged access we are going to use setfacl command.

  #Set specific user or group permissions on a file or directory:
  setfacl -m u:user_name:permissions /path/to/file_or_directory
  setfacl -m g:group_name:permissions /path/to/file_or_directory

  #Remove a specific user or group entry from the ACL:
  setfacl -x u:user_name /path/to/file_or_directory
  setfacl -x g:group_name /path/to/file_or_directory

  #Remove all extended ACL entries for a file or directory:
  setfacl -b /path/to/file_or_directory

Now switch to your user for me its user2.

You can see, I gave my user the read privilege and it can easily read the hello file but it cannot edit it Now, if I switch as some other user and try to read or access the file, I will not be able to do it.

This is how you can bring ACL commands into action.

Thanks for giving your time ❤️❤️

Linux Access Control List (ACL)