Every file on a computer has three classes of permission: user, group and others.

Great work! We can see the permissions when we use the long format of the ls command.

Psst: characters 2, 3 and 4 refer to the permissions of user, 5, 6 and 7 refer to group, and 8, 9 and 10 refer to others.

Do you remember the long-format option of the ls command?