Run cat /etc/nginx/sites-available/learn.conf.
cat /etc/nginx/sites-available/learn.conf
Click any instruction for the command details, the why, and the common mistake to avoid.
Run cat /etc/nginx/sites-available/learn.conf.
cat /etc/nginx/sites-available/learn.conf
Run grep Content-Security-Policy /etc/nginx/sites-available/learn.conf.
grep Content-Security-Policy /etc/nginx/sites-available/learn.conf
Run nginx -t.
nginx -t
Create a free account to sync completed lessons, XP, streaks, course status, and your next lesson across sessions.
Checking account status...
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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.
Review and validate web server config.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
cat <file>
Print text file contents.
grep [-i] <text> <file>
Find literal text inside a file.
nginx -t
Validate training nginx configuration.