MCQ · Linux administration: from discovery to expertise

Linux administration: from discovery to expertise

Test your knowledge by answering this MCQ. It is advisable to do it before and after the training to evaluate your progress. Warning: the questions are random and AI-generated.

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1. What does <code>cmd > out.log 2>&1</code> do?

Sends output and errors to out.log Sends only errors to out.log Appends output to out.log Runs the command in the background

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Linux administration: from discovery to expertise

1. What does <code>cmd > out.log 2>&1</code> do?

2. <code>ss -tlnp</code> shows <code>127.0.0.1:8080</code>. What can you conclude?

3. What is the risk of <code>usermod -G devs alice</code>?

4. Why use the UUID in /etc/fstab?

5. Which process has PID 1 on a modern distribution?

6. Why put variables in double quotes (<code>"$f"</code>)?

7. df shows a full disk but du cannot find the files. Most likely cause?

8. Which pipe counts each line's occurrences, most frequent first?

9. What does <code>chmod 640 file</code> give?

10. In <code>free -h</code>, which column shows memory actually available?

11. Before enabling a default-deny firewall on a remote server, you must:

12. Which <code>lvextend</code> option also grows the file system?

13. Which command should you use to edit sudo rules?

14. A load of 12 on a 4-core server with low CPU usage often indicates:

15. After editing a systemd unit file, what must you run?

16. Which directory holds system configuration files?

17. Which SSH settings are recommended on an exposed server? (several answers)

18. What does <code>set -euo pipefail</code> do in a script?

19. What does the 3-2-1 backup rule mean?

20. What should you do if SELinux blocks an application?

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1. What does <code>cmd &gt; out.log 2&gt;&amp;1</code> do?

2. <code>ss -tlnp</code> shows <code>127.0.0.1:8080</code>. What can you conclude?

3. What is the risk of <code>usermod -G devs alice</code>?

4. Why use the UUID in /etc/fstab?

5. Which process has PID 1 on a modern distribution?

6. Why put variables in double quotes (<code>"$f"</code>)?

7. df shows a full disk but du cannot find the files. Most likely cause?

8. Which pipe counts each line's occurrences, most frequent first?

9. What does <code>chmod 640 file</code> give?

10. In <code>free -h</code>, which column shows memory actually available?

11. Before enabling a default-deny firewall on a remote server, you must:

12. Which <code>lvextend</code> option also grows the file system?

13. Which command should you use to edit sudo rules?

14. A load of 12 on a 4-core server with low CPU usage often indicates:

15. After editing a systemd unit file, what must you run?

16. Which directory holds system configuration files?

17. Which SSH settings are recommended on an exposed server? (several answers)

18. What does <code>set -euo pipefail</code> do in a script?

19. What does the 3-2-1 backup rule mean?

20. What should you do if SELinux blocks an application?

My progress

Recommended Articles

Le shell Bash et les fichiers : navigation, redirections, pipes et traitement de texte

Utilisateurs, groupes, sudo et permissions sous Linux

Paquets, services systemd, journaux et tâches planifiées

Stockage sous Linux : disques, partitions, systèmes de fichiers et LVM

Réseau sous Linux : configuration, diagnostic, pare-feu et SSH

Bonnes pratiques d'administration Linux

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1. What does <code>cmd > out.log 2>&1</code> do?