Adam's zsh page

zsh is a great UNIX shell. It has all the benefits of other standard shells, and a hell of a lot more on top. I'm interested in the interactive features in particular, because they can save you a lot of time and effort.

Why bother with zsh?

OK, here's some of the really cool stuff. A few of the other shells have some of these features, although in general zsh does it more comprehensively.

A mind-bogglingly powerful new completion system, complete with out of the box completion heuristics for many standard UNIX commands. Very little effort is required to utilise this system, which can save hours of typing in the long run.
Globbing -- extremely powerful, basically an easier-to-type replacement for find, e.g. to find all ssh-agent sockets owned by yourself:
```
zsh% ls /tmp/ssh-*/*(=U)
       
```
Coloured menu completion (just bounce on the TAB key until what you want appears)
Multi-line commands editable as a single buffer (even files!)
Variable editing (vared) -- finally you can easily edit your $PATH interactively
Command buffer stack -- halfway through typing a complex command on a crappy old terminal and suddenly realise you need to do some other stuff first? Just hit M-q ... your command gets pushed onto the stack to be automatically popped off next time you hit enter.
Print text straight into the buffer for immediate editing (print -z)
Inline expansion of variables and history commands
Advanced history handling, included incremental sharing with multiple simultaneous shells
Handling of multiple redirections (simpler than tee)
Large number of options for tailoring (see my .zshrc)
Spelling correction
Manipulation of arrays (including reverse subscripting)
Comprehensive integer and floating point arithmetic
Adaptable messages for: spelling correction, watching of users logging on/off, new mail in multiple mailboxes, time as well as prompt (including conditional expressions)
Dynamically loadable modules including one providing command-line-based ftp client functionality.
A themeable prompts system full of silly prompts, some pinched from bashprompt and improved, others written from scratch. There is a screenshot available which demonstrates this system. To use it, simply install zsh 4, and then do the following at your prompt:
```
zsh% autoload promptinit
zsh% promptinit
zsh% prompt -h 
```
Please note that you'll need the relevant X terminal fonts installed so that your X server can get at them. I've made up a tarball of the fonts I use and a README which briefly explains how to install the fonts. Someone else did a similar page before me too.
Countless other improvements. The zsh FAQ currently mentions some of them.

Versions of zsh

Confused about the various versions of zsh available? Here's a quick summary:

4.0.4: The latest stable release, at the time of writing. You can always get the latest stable version from zsh's file area on sourceforge.net.
SourceForge CVS: The latest development tree is available via CVS from sourceforge.net. zsh also has a project home page on this site.
4.1.x-dev-y: The latest official development release branch, at the time of writing. These are official intermediate development versions compiled by Peter Stephenson (pws) from patches selected from zsh-workers and committed to the HEAD branch in CVS. They are sometimes released once a week, sometimes less often, and are available in the development subdirectory of your local mirror site; see www.zsh.org to find out which mirror site is nearest to you.)

If you were to put them on a scale, it would be something like this:

    4.x.y, x even    4.x.y, x odd    intermediate devel        CVS at
    (e.g. 4.0.2)     (e.g. 4.1.0)    releases (dev, pws)   sourceforge.net

  <------------------------------------------------------------------------>

    least often released /                          most often released /
    most stable                                     most bleeding edge

Other resources

Other bits'n'pieces available:

My personal shell configuration files and other useful utilities
Wondering how to get more out of your UNIX shell? Have a look at this UNIX shells page I wrote a while ago.

Peter Stephenson has written an excellent, user-friendly user's guide to zsh which is very helpful for those who really want to get to grips with the power features of zsh.