zsh
also: Z shell
Zsh is an advanced interactive shell and command language for Linux and Unix systems that extends bash with powerful features like improved tab completion, spelling correction, and advanced pattern matching.
Zsh (the Z shell) is a modern Unix shell that serves as both an interactive login shell and a scripting language interpreter. It is fully compatible with POSIX sh while adding numerous enhancements borrowed from bash, ksh, and tcsh.
Key features include intelligent tab completion that understands context and file types, automatic spelling correction of mistyped commands, glob patterns that can match files recursively, and built-in support for themes and plugins through frameworks like Oh My Zsh. For example, typing cd /u/lo/bi and pressing Tab can automatically expand to cd /usr/local/bin/ by matching path segments.
Zsh is often chosen by developers and power users as their default shell to replace bash. It can be set as your login shell with chsh -s /bin/zsh, and its extensive customization through the .zshrc configuration file makes it highly adaptable to individual workflows.