This article is part of a series about Zsh: Becoming a zsh master Configuring Zsh Without Dependencies A Guide to Zsh Expansion with Examples A Guide to the Zsh Completion with Examples A Guide to the Zsh Line Editor with Examples What would we do if we couldn’t use the wonderful TAB key to expand our commands, filenames, or variables in our lovely shell? Not much, I’m afraid. We would still live in dark caves, hunting some dangerous Mammoth with knives made of stones!