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Free module

Operating systems and Linux

Learn Linux and operating systems hands on: files, permissions, processes, services and logs, worked in a real Linux lab.

6 lessons320 min lessonFoundations

The lessons

Each lesson is free to read in full. Create a free account to run its commands in a live lab and to sit its quizzes and tasks.

  1. 1 · Virtual machine lab

    Files and the shell

    I can work with files and folders from a shell.

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  2. 2 · Virtual machine lab

    File permissions: who may read, write or run

    I can say who may read, write or run a file, and change it.

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  3. 3 · Virtual machine lab

    Stopping a running program the right way (signals)

    I can find a process and stop it the right way.

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  4. 4 · Virtual machine lab

    Background services and timed jobs (systemd, cron)

    I can run a program as a service and schedule a job.

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  5. 5 · Virtual machine lab

    Logs and monitoring

    I can find what went wrong in a log.

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  6. 6 · Virtual machine lab

    How a small mistake gives away root

    I can explain how a mistake lets a user become root and how to close it.

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Worked in a real lab

Every lesson of this module is worked in a lab started for you alone. The labs it uses:

Teaching a class? Set this module for your students with a teacher guide, marked assignments and a lab for every student.