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Screenshot of a zsh session
|Original author(s)||Paul Falstad|
|Developer(s)||Peter Stephenson, et al.|
|Stable release||5.0.2 / December 21, 2012|
The Z shell (zsh) is a Unix shell that can be used as an interactive login shell and as a powerful command interpreter for shell scripting. Zsh can be thought of as an extended Bourne shell with a large number of improvements, including some features of bash, ksh, and tcsh.
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's (then a teaching assistant at Princeton University) name — Paul Falstad thought that Shao's login name, "zsh", was a good name for a shell. The American English pronunciation of Z is "zee", so Z shell rhymes with C shell, a homophone of seashell.
Features of note include:
- Programmable command-line completion that can help the user type both options and arguments for most used commands, with out-of-the-box support for several hundred commands
- Sharing of command history among all running shells
- Extended file globbing allows file specification without needing to run an external program such as find
- Improved variable/array handling
- Editing of multi-line commands in a single buffer
- Spelling correction
- Various compatibility modes, e.g. zsh can pretend to be a Bourne shell when run as
- Themeable prompts, including the ability to put prompt information on the right side of the screen and have it auto-hide when typing a long command
- Loadable modules, providing among other things: full TCP and Unix domain socket controls, an FTP client, and extended math functions
- Fully customizable
Attesting to the sheer size of this shell is the famous first sentence of the shell's manual page, which reads "Because zsh contains many features, the zsh manual has been split into a number of sections" and then goes on to list seventeen items.
- "The Z Shell Manual", Version 5.0.0, Sourceforge.net, July 21, 2012. Retrieved September 18, 2012.
- "zsh - a ksh/tcsh-like shell (part 1 of 8)", alt.sources, December 14, 1990. Retrieved September 18, 2012.
- "Z-Shell Frequently-Asked Questions", Sourceforge.net, February 15, 2010. Retrieved September 18, 2012.
- "The Z-Shell (ZSH) Lovers' Page", Guckes.net, c. 2004. Retrieved October 2, 2012.
- "Zsh Mailing List Archive", Zsh.org, August 8, 2005. Retrieved October 2, 2012.