Run echo training.
echo training
Mission 04
Command history
Run a few safe commands, review history, and clear the display without resetting state.
Terminal basicsechohistoryclear
Lesson 4 of 360
0/360 lessons
0/17 missions
Terminal basics · 6 minutes
New learnerrank
0XP
0%complete
learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
6 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run history.
history
Run clear.
clear
Save progress
Keep learning across sessions.
Create a free account to sync completed lessons, XP, streaks, course status, and your next lesson across sessions.
Checking account status...
Progress sync is idle.
0XP
New learnerrank
0day streak
0best streak
0daily streak
0lessons
0courses
0missions
0tasks
Noverified
Progress sync stores completion IDs, scores, streaks, badges, and game settings. Terminal contents, editor snippets, lab scratch, email, and real names are never published on leaderboards or share cards.
Lesson support
What to notice while you play.
Understand the difference between clearing the screen and resetting the lab.
Run echo training first so history has something to show.
History can help repeat safe commands, but it can also reveal pasted secrets in real shells.
- Thinking clear deletes command history.
- Putting secrets into shell commands.
Reference
Commands in this lesson.
echo <text>
Print text or write lab notes with >.
history
Show recent commands.
clear
Clear terminal output.