linux下使用zsh和配置oh-my-zsh的步骤
Bash确实是不错的Shell，但仍有用很多不尽人意的地方，如自动补全的功能不够强大，定位较长路径不够方便，命令历史管理不够完善等。
介绍使用zsh，功能十分强大…推荐给大家！
1 介绍zsh
1.1 Linux shell
常用的Shell有这么几种，sh、bash、csh等，想知道你的系统有几种shell，可以通过以下命令查看：
cat /etc/shells
未安装zsh，显示结果如下：
/bin/sh
/bin/bash
/sbin/nologin
/bin/dash
/bin/tcsh
/bin/csh
1.2 zsh简介
Zsh是一个Linux下强大的shell, 由于大多数Linux产品安装，以及默认使用bash shell, 但是丝毫不影响极客们对zsh的热衷, 几乎每一款Linux产品都包含有zsh，通常可以用apt-get、urpmi或yum等包管理器进行安装
Zsh具有以下主要功能
开箱即用、可编程的命令行补全功能可以帮助用户输入各种参数以及选项
在用户启动的所有shell中共享命令历史
通过扩展的文件通配符，可以不利用外部命令达到find命令一般展开文件名
改进的变量与数组处理
在缓冲区中编辑多行命令
多种兼容模式，例如使用/bin/sh运行时可以伪装成Bourne shell
可以定制呈现形式的提示符；包括在屏幕右端显示信息，并在键入长命令时自动隐藏
可加载的模块，提供其他各种支持：完整的TCP与Unix域套接字控制，FTP客户端与扩充过的数学函数
完全可定制化
1.3 zsh与oh-my-zsh终极配置
之前是因为看到这篇文章：终极Shell——Zsh 才选择使用zsh，被它的自动完成、补全功能吸引了。
<官网：www.zsh.org
这也是“工欲善其事，必先利其器”系列文章。
选择oh-my-zsh, oh-my-zsh是基于zsh的功能做了一个扩展，方便的插件管理、主题自定义，以及漂亮的自动完成效果。
在Github上找关于zsh的项目时发现的，试用了一下觉得很方便，不用像上面文章里面提到的那么复杂，配置一些插件的名称即可使用相应的功能。
官网：https://github.com/robbyrussell/oh-my-zsh
评价：https://github.com/robbyrussell/oh-my-zsh/wiki/Testimonials
2 安装zsh
2.1 安装zsh
对于一般的Ubuntu系统，配置好正确的源之后，就能直接键入以下命令安装：
sudo apt-get install zsh
对于linux系统，直接使用以下命令安装：
yum -y install zsh
2.2 配置zsh
把.zshrc拷贝到相应用户的home目录即可
(也可以把你的bash的配置文件(/.bash_prorile或者/.profile等)给拷贝到zsh的配置文件~/.zshrc里，因为zsh兼容bash)
使用 Zsh 扩展集合：oh-my-zsh
oh-my-zsh 帮我们整理了一些常用的 Zsh 扩展功能和主题：https://github.com/robbyrussell/oh-my-zsh
我们无需自己去捣搞 Zsh，直接用 oh-my-zsh 就足够了，如果你想继续深造的话那再去弄。
先安装 git：sudo yum install -y git
安装 oh-my-zsh（这个过程可能会有点慢，或者需要重试几次）：wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O - | sh
安装效果图如下：
在以 root 用户为前提下，oh-my-zsh 的安装目录：/root/.oh-my-zsh
在以 root 用户为前提下，Zsh 的配置文件位置：/root/.zshrc
为 root 用户设置 zsh 为系统默认 shell：chsh -s /bin/zsh root
如果你要重新恢复到 bash：chsh -s /bin/bash root
现在你关掉终端或是重新连上 shell，现在开头是一个箭头了，如下图：
现在zsh和oh-my-zsh都安装好了，现在重点讲下zsh的配置!
创建~/.zshrc配置文件，先给看下我的配置，可以凭自己喜好更改：
# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH
# Path to your oh-my-zsh installation.
export ZSH=/home/amoscykl/.oh-my-zsh
# Set name of the theme to load. Optionally, if you set this to "random"
# it'll load a random theme each time that oh-my-zsh is loaded.
# See https://github.com/robbyrussell/oh-my-zsh/wiki/Themes
# zhs的主题
ZSH_THEME="ys"
# Set list of themes to load
# Setting this variable when ZSH_THEME=random
# cause zsh load theme from this variable instead of
# looking in ~/.oh-my-zsh/themes/
# An empty array have no effect
# ZSH_THEME_RANDOM_CANDIDATES=( "robbyrussell" "agnoster" )
# Uncomment the following line to use case-sensitive completion.
# CASE_SENSITIVE="true"
# Uncomment the following line to use hyphen-insensitive completion. Case
# sensitive completion must be off. _ and - will be interchangeable.
# HYPHEN_INSENSITIVE="true"
# Uncomment the following line to disable bi-weekly auto-update checks.
# DISABLE_AUTO_UPDATE="true"
# Uncomment the following line to change how often to auto-update (in days).
# export UPDATE_ZSH_DAYS=13
# Uncomment the following line to disable colors in ls.
# DISABLE_LS_COLORS="true"
# Uncomment the following line to disable auto-setting terminal title.
# DISABLE_AUTO_TITLE="true"
# Uncomment the following line to enable command auto-correction.
# ENABLE_CORRECTION="true"
# Uncomment the following line to display red dots whilst waiting for completion.
# COMPLETION_WAITING_DOTS="true"
# Uncomment the following line if you want to disable marking untracked files
# under VCS as dirty. This makes repository status check for large repositories
# much, much faster.
# DISABLE_UNTRACKED_FILES_DIRTY="true"
# Uncomment the following line if you want to change the command execution time
# stamp shown in the history command output.
# The optional three formats: "mm/dd/yyyy"|"dd.mm.yyyy"|"yyyy-mm-dd"
# HIST_STAMPS="mm/dd/yyyy"
# Would you like to use another custom folder than $ZSH/custom?
# ZSH_CUSTOM=/path/to/new-custom-folder
# Which plugins would you like to load? (plugins can be found in ~/.oh-my-zsh/plugins/*)
# Custom plugins may be added to ~/.oh-my-zsh/custom/plugins/
# Example format: plugins=(rails git textmate ruby lighthouse)
# Add wisely, as too many plugins slow down shell startup.
# z命令快速跳转目录 x命令解压一切文件 命令行可以直接google
plugins=(
git z zsh-autosuggestions extract web-search zsh-syntax-highlighting
)
source $ZSH/oh-my-zsh.sh
# User configuration
# export MANPATH="/usr/local/man:$MANPATH"
# You may need to manually set your language environment
# export LANG=en_US.UTF-8
# Preferred editor for local and remote sessions
# if [[ -n $SSH_CONNECTION ]]; then
# export EDITOR='vim'
# else
# export EDITOR='mvim'
# fi
# Compilation flags
# export ARCHFLAGS="-arch x86_64"
# ssh
# export SSH_KEY_PATH="~/.ssh/rsa_id"
# Set personal aliases, overriding those provided by oh-my-zsh libs,
# plugins, and themes. Aliases can be placed here, though oh-my-zsh
# users are encouraged to define aliases within the ZSH_CUSTOM folder.
# For a full list of active aliases, run `alias`.
#
# Example aliases
# alias zshconfig="mate ~/.zshrc"
# alias ohmyzsh="mate ~/.oh-my-zsh"
#
保存并执行命令，使配置生效：
cd ~ && source .zshrc