Fish is a command line shell designed for macOS, Linux, and other similar operating systems. It is known for its user-friendly features such as syntax highlighting, autosuggest, and tab completions without the need for configuration. The official website, fishshell.com, provides downloads and screenshots for interested users. Fish works similarly to other popular shells like bash or zsh, with a few important differences that can be found in the tutorial section of the website. It is available for installation through various methods, depending on the operating system. Additionally, fish can be customized and built from source using the provided instructions. Development and support for fish can be found through their mailing list, gitter.im channel, or by posting on Unix & Linux Stackexchange.
https://github.com/fish-shell/fish-shell