ZSH

The Z shell (Zsh) is a Unix shell that can be used as an interactive login shell and as a command interpreter for shell scripting. Zsh is an extended Bourne shell with many improvements, including some features of Bash, ksh, and tcsh

Paul Falstad wrote the first version of Zsh in 1990[5] while a student at Princeton University.[6] The name zsh derives from the name of Yale professor Zhong Shao (then a teaching assistant at Princeton University) — Paul Falstad regarded Shao's login-id, "zsh", as a good name for a shell.[7][8] Zsh was at first intended to be a subset of csh for the Commodore Amiga, but expanded far beyond that. By the time of the release of version 1.0 in 1990 the aim was to be a cross between ksh and tcsh – a powerful "command and programming language" that is well-designed and logical (like ksh), but also built for humans (like tcsh), with all the neat features like spell checking, login/logout watching and termcap support that were "probably too weird to make it into an AT&T product".[9] Zsh is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities.[10] In 2019, macOS Catalina adopted Zsh as the default login shell, replacing the GPLv2 licensed version of Bash,[11] and when Bash is run interactively on Catalina, a warning is shown by default.[12] In 2020, Kali Linux adopted Zsh as the default shell since 2020.4 release.[13]