Topics
Security
Data formats
Text
Linux and network
Encoding and conversion
Where to start
First steps
15 stages · From system basics and command input to navigation, files, text, and pipelines.
Track map 11 tracks · 123 stages
Difficulty
New labs
Sections 183 articles
Command index 432
Popular
Packages, services, and logs
One correct answer
systemctl is-active nginx
active
curl -I http://localhost/
HTTP/1.1 200 OK
sudo journalctl -u nginx -p err
systemctl is-enabled nginx
enabled
sudo nginx -t