Glossary Tool
Z shell (zsh)
zsh is a Unix shell commonly used as an interactive command-line environment on macOS and Linux.
Z shell (zsh) is the default interactive shell on modern macOS and a common choice on Linux.
People use it for aliases, functions, prompt customisation, completion, and environment setup. That makes it the place where developer convenience can either shine or quietly turn into a slow login shell.
When a .zshrc grows, keep an eye on startup time. Lazy-load heavy tools, avoid work that runs on every prompt, and keep project-specific setup inside the project where possible.