This reference collects 534 everyday and modern Linux commands grouped into 30 categories - system information, files and directories, search, mounting, users and groups, permissions, archiving, package managers (RPM, YUM, DEB, APT, DNF), text processing, file systems, backup, networking, iptables, monitoring, systemd services and containers.
Each command is shown with a plain-English description, a root marker when superuser privileges are required, and a danger marker when running it can delete data or take the system down. The modern commands include ip, ss, systemctl, journalctl, dnf, apt, zstd, Docker, kubectl, jq and fast modern alternatives such as fd, ripgrep, bat, eza, btop and duf. Search works on the command text, the description and the category name.