Section outline

Main course page

Unit 3: the filesystem (60 minutes)
Unit 5: pipelining and redirection (60 minutes)

  • Unix-based operating systems offer a notion of file and folder "ownership" that allows you to control who can access your files and folders, and in which ways.
    This is especially important when using a filesystem that is shared between multiple users, such as in our very own aquarium environment.

    Relevant links:
    Unit playlist
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    • Users, superusers and groups URL

      We will learn about Linux users, superusers and groups and how to use 'su', 'adduser', 'passwd', and 'group'.
      Note: 'group' is not a standard Linux command, and probably will not work on local Linux installations.

    • File ownership URL

      We will learn about file ownership and how to transfer it using 'chown' and 'chgrp'.

    • Permissions - what are they? URL

      We will learn about read, write and execute permissions for files and folders.

    • Users, ownership and permissions quiz
      A very short quiz on users, ownership and basic permissions.
    • Changing permissions URL

      We will learn how to change permissions using 'chmod'.
      Optional reading material:
      Permissions cheatsheet

    • Sharing files URL

      We will learn how to share files using 'chmod' and 'chgrp'.

    • Optional: Advanced permissions quiz

      Permissions are a very important concept! Here is a very fun quiz on the subject.

    • Meme for finishing this unit Page

      Once you finish this unit, you'll be able to open this page and see a meme!

      Not available unless: The activity Users, ownership and permissions quiz is complete and passed
Unit 3: the filesystem (60 minutes)
Unit 5: pipelining and redirection (60 minutes)