Continue your lesson
Connect the command you run to the file, process, service, permission, or kernel state it changes.
Block 1 of 4Understand Filesystem check
Current · 10 min
Understand Filesystem check
Optional concept notes
Filesystem check
Examines filesystem metadata after corruption or an unclean shutdown.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Block 2 of 4Understand SMART data
12 min
Understand SMART data
Optional concept notes
SMART data
Reports drive health attributes self-test results and possible predictive-failure indicators without predicting every failure.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Block 3 of 4Understand Out-of-memory killer
10 min
Understand Out-of-memory killer
Optional concept notes
Out-of-memory killer
Terminates selected processes when the kernel cannot satisfy memory demand.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Block 4 of 4Understand Initramfs rebuild
12 min
Understand Initramfs rebuild
Optional concept notes
Initramfs rebuild
Regenerates early-boot drivers and scripts after relevant system changes.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Use a disposable Linux system. Predict a command's effect, run it, inspect exit status and logs, then restore the starting state.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 5.2 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.