The permissions or mode of a file you we will be familiar with is Read, Write, and eXecute (RWX). These permissions can be set to the three objects:

The standard permissions are shown with their octal notation, should you want a quick revision exercise, as follows:

There is a fourth block of permissions that precedes user, group, and others. This block is for the special permissions; however, rather than representing RWX, the permissions comprise of:

Using symbolic notations, these permissions can be added to file1, which acts as our axiom for the filename during the following demonstration:

$ chmod u+s file1 #adding the SUID Bit
$ chmod g+s file1 #adding the SGID Bit
$ chmod o+t file1 #adding the Sticky Bit