.. historic nodename: Introduction

Introduction
================================================================================
.. index:: single: introduction; Command

.. only:: man

    Overview
    --------------------------------------------------------------------------------
    Because zsh contains many features, the zsh manual has been split into
    a number of sections:
    
        
        * :emphasis:`zsh`          Zsh overview
        * :emphasis:`zshroadmap`   Informal introduction to the manual
        * :emphasis:`zshmisc`      Anything not fitting into the other sections
        * :emphasis:`zshexpn`      Zsh command and parameter expansion
        * :emphasis:`zshparam`     Zsh parameters
        * :emphasis:`zshoptions`   Zsh options
        * :emphasis:`zshbuiltins`  Zsh built-in functions
        * :emphasis:`zshzle`       Zsh command line editing
        * :emphasis:`zshcompwid`   Zsh completion widgets
        * :emphasis:`zshcompsys`   Zsh completion system
        * :emphasis:`zshcompctl`   Zsh completion control
        * :emphasis:`zshmodules`   Zsh loadable modules
        * :emphasis:`zshcalsys`    Zsh built-in calendar functions
        * :emphasis:`zshtcpsys`    Zsh built-in TCP functions
        * :emphasis:`zshzftpsys`   Zsh built-in FTP client
        * :emphasis:`zshcontrib`   Additional zsh functions and utilities
        * :emphasis:`zshall`       Meta-man page containing all of the above
    
    Description
    --------------------------------------------------------------------------------
    

Zsh is a UNIX command interpreter (shell) usable as an interactive
login shell and as a shell script command processor.  Of the standard shells,
zsh most closely resembles :strong:`ksh` but includes many enhancements.  It
does not provide compatibility with POSIX or other shells in its
default operating mode:  see
:zshsectref:`Compatibility <below>`.

Zsh has command line editing, builtin spelling correction, programmable
command completion, shell functions (with autoloading), a history
mechanism, and a host of other features.

.. include:: metafaq.rst

.. only:: not man

    
    
    .. include:: seealso.rst
    

