Run test -f scripts/deploy.sh.
test -f scripts/deploy.sh
Click any instruction for the command details, the why, and the common mistake to avoid.
Run test -f scripts/deploy.sh.
test -f scripts/deploy.sh
Run test -d scripts.
test -d scripts
Run echo guard-reviewed > lab/guard.txt.
echo guard-reviewed > lab/guard.txt
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.
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.
Use test commands as script-style guards.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
echo <text>
Print text or write lab notes with >.
test -e|-f|-d <path>
Check path type in a training-friendly way.