Unix/Linux file system security is developed in such a way that it provides best protection method for storing files. So lets invest some time in Understanding file permissions in Unix or Linux and modify using Chmod. The file permissions in Unix or Linux contains majorly three attributes namely owner/user,Group , Other(rest of the world). Here, Owner/user is the person who creates the file. Group implies that the group the user belong to, and lastly Other is rest of the world implies other users from other groups etc.Here only owner or root can change the permissions and these privileges cannot be delegated.