CS / DS

Terminal Mastery

The definitive guide to shells, commands, and scripting: 51 chapters across ten parts. It carries you from terminal-versus-shell-versus-tty foundations through Bash as a real programming language, the text-processing toolkit (regex, grep, sed, awk), the operating system from the shell, every major shell family (Zsh, Fish, ksh, Nushell, PowerShell, and beyond Unix into WSL and Git Bash), multiplexers and SSH, and production-grade scripting. Part history, part field guide, it closes on Grid: the case that everything in these pages points toward a substrate where a program is not instructions an agent runs but the place an agent lives. Free to read, yours to keep.