zsh or The Z Shell is one of the newest shells with an enhanced command line editing interface.
Find zsh-*.rpm in your distribution or simply search via RPM Search and download the file. run as root
rpm -ihv zsh-*.rpm
zsh can be installed from Debian's main repository, using your APT front end of choice. For example, run as root:
apt-get install zsh
aptitude install zsh
will install zsh and any packages on which zsh depends.
A package with documentation, zsh-doc is also available.
Currently avalible 4.2.6 stable version. If you want to install zsh on gentoo, simply type in console:
emerge -av zsh
(cd /usr/ports/shells/zsh;make install clean)
At this time the developent versions of zsh support utf-8 (your can simply install zsh from cvs. With this feature you can use zsh with any language.
To setup zsh for day-to-day use, it's posible to change default shell (don't use the feature with root user if you don't understand this).
chsh -s `which zsh`
The Zshell(Zsh) has comfortable history. You can also tune history engine in zsh.