Using Octal Permissions to Set up a Collaboration Area

15 minutes
  • 2 Learning Objectives

About this Hands-on Lab

In a multi-user environment like Linux, there will come a need to have a specific area set aside for different uses to collaborate. This lab will walk through the process and make sure you understand how different permissions can work together.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Ensure /opt/collab Can Be Accessed by the Other Managers but Not Will

The first thing we need to do is make sure Bob, Adam, and Sally are all members of the same group. This will allow us to use octal permissions on the group section to allow access.

If we run id bob, id adam, and id sally, we’ll see that they’re all members of the managers group.

So we can run chown bob.managers /opt/collab and chmod 770 /opt/collab to lock the directory down to Bob and the managers group.

Ensure Files Written Can Be Read by All Users

As bob, adam, and sally, touch a file in /opt/collab and then try and cat all of those files as those 3 users.

Adam failed. Let’s look at why.

The permissions on adam‘s file are 600, so his user can access the file but the other managers can’t. If we check adam‘s .bash_profile we see his umask is set incorrectly for this task. Edit his .bash_profile and set his umask to 026 and try this again.

Additional Resources

Adam, Bob, and Sally are managers that all have access to our server. They need a directory that all of them can access and read and write files into. Bob has created a directory named /opt/collab for them to use, but isn't sure how to give Adam and Sally permission without also giving Will (not a manager) permission. We've been tasked with setting up this area and ensuring that files written in there can be read by all the users.

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