Additional commands for manipulating file/directory security aspects

In this recipe, we're going to use our users – Jack, Joe, Jill, and Sarah – to create a specific scenario to explain permissions, ACLs, and umask usage. A short explanation of these concepts is as follows: permissions are used to control access to files and folders in read, write, and execute mode. As they're limited in granularity, a concept of ACL was developed, to be able to manage permissions on a more finely grained level. Umask is a variable that pre-determines which permissions are going to be assigned to a newly created file or directory.

The recipe will go like this:

• We need to create a collaborative directory for our students located at /share/students
• We need to create a collaborative directory for our professors located at /share/professors
• Members of the student group need to have access to /share/students to collaborate on project files
• Members of the...