The most important factor for every organization is security. Linux is widely known for its security factor.
Linux ensures security and control over sensitive data (files ) & directories. Linux allows administrators to manage the access for users and groups.
To understand file permission we will create a simple file
touchtest.txt - Create a file with the touch commandls -ltrto see the details of the files
Two important mechanisms that Linux provides are:
File permission
Access control list
Linux File Ownership
Users: the user is the owner of the file and the application
- "
chown" is used to change the ownership permission of a file or directory.
Group: Groups that own the file and applications.
- "
chgrp" is used to change the group permission of a file or directory.
Other: All users with access to the system.
others — All users with access to the system. (outside the users are in a group)
There are three kinds of file permissions in Linux:
Read(r): Allows a user or group to view a file.Write(w): Permits the user to write or modify a file or directory.Execute(x): A user or group with execute permissions can execute a file or view a directory.
Permission numbers are:
0 = ---
1 = --x
2 = -w-
3 = -wx
4 = r-
5 = r-x
6 = rw-
7 = rwx
For example:
chmod 777 folder name will give read, write, and execute permissions for everyone.
chmod 700 folder name will give read, write, and execute permissions for the user only.
Task :
change the user permissions of the file and note the changes after ls -ltr
The above task changed the file permission to execute.
Access Control List
ACL is a service that is used for providing special permission to specific Users & Groups for particular files and directories. ACLs can set read, write, and execute permissions for the owner, group, and other users.
getfacl - To check the Access Control permission.
setfacl - command is used to set ACL permission.
In the Above task set ACL permission to the user.
Thank you for reading this blog.
Happy Learning!