Like it or not, systemd is the init system of virtually every current distribution — Ubuntu, Debian, Fedora, Arch, openSUSE. Mastering half a dozen commands handles 90% of everyday service management. Here are the essentials, straight to the point. Managing services systemctl status nginx # status, PID, last log lines sudo systemctl … Read more
What is DNS DNS stands for Domain Name System (Sistema de Nomes e Domínios in Portuguese), which converts the website domain names people type into web browsers into IP numbers. … Read more
Note (2026): originally published on 2017, this guide has been revised for current reference; the archive PDF remains identified as historical material. You don't need to memorize hundreds of commands: you need to recognize the task, find the tool, and check what … Read more
