Learn how to configure access rights in Linux to control who can access specific information. Understand the core concepts and explore practical examples of permissions management to maintain the security of your system and data.

In Ubuntu, individual users, groups, and other users have default access permissions. Here are some key details:

1. File Owner: Has all access rights: read, write, and execute (rwx);
2. File Group: Typically has read and write permissions (rw);
3. Other Users: Have only the right to read (r).

These permissions can be modified using the chmod command.

The command chmod u=rw,g=r,o=- myfile.txt sets the following permissions for the file myfile.txt:

1. The user (owner) gets read and write permissions (rw);
2. The group gets read permission (r);
3. Others have no access (-).

This command strictly limits access to the myfile.txt file, allowing only the owner to read and write to it, while allowing the group to read and denying access to all other users.