一、内核和进程描述
内核由一系列程序组成，包括负责响应中断的中断服务程序、负责管理多个进程从而分享处理器时间的调度程序、负责管理地址空间的内存管理程序、网络、进程间通信的系统服务程序等。
二、Oh My Zsh
Zsh is a shell designed for interactive use, although it is also a powerful scripting language.Many of the useful features of bash, ksh, and tcsh were incorporated into zsh; many original features were added.
（Zsh 是为交互使用而设计的一款shell，同时它也是一个强大的脚本语言。很多其他shell的特性, 比如bash、ksh、tcsh, 都被整合到了Zsh中, 并且还添加了很多新的特性）
Oh My Zsh is a delightful, open source, community-driven framework for managing your Zsh configuration. It comes bundled with a ton of helpful functions, helpers, plugins, themes, and a few things that make you shout…
（Oh My Zsh是一个令人愉快的、开源的、社区驱动的Zsh配置管理框架。它配置了成吨的有用的函数、帮助信息、主题，还有一些令你尖叫的东西。）
安装
1.chsh -s /bin/zsh
2.git clone git://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh
3.cp ~/.oh-my-zsh/templates/zshrc.zsh-template ~/.zshrc
4.cd oh-my-zsh/tools && ./install.sh
5.upgrade_oh_my_zsh
或者
sh -c “$(wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)”
