chmodcommand is used to control the access permissions for directories. We can use the octal notation to set permissions. To describe the octal notation, we can add permission values to obtain new, combined (octal) values.
chmodpermission. The first digit represents the permissions of the user, the second represents the group, and the third represents global permissions. So if a file has permissions
754, the user can read, write, and execute; the group can read and execute, while all other users can only read.
600is a common setting for data files that the owner wants to keep private. The owner may read and write a file. All others have no rights.
600is equivalent to
chmodcommand to set it to