[ Thanks to linuxaria for this link.
“zsh it’s a perfect alternative to the classic bash
that we have as default on our linux box.
“zsh is a shell designed for interactive use, although it is
also a powerful scripting language. Many of the useful features of
bash, ksh, and tcsh were incorporated into zsh; many original
features were added.
“The first version of zsh was written by Paul Falstad in 1990
when he was a student at Princeton University.
“The name zsh derives from Yale professor Zhong Shao, then a
teaching assistant at Princeton University. Paul Falstad thought
that Shao’s login name, “zsh”, was a good name for a shell.”