摘要：
# I'm testing Markdown...##Refs:1. [Linux Shell Scripting Cookbook(2nd Edition)](http://book.douban.com/subject/24669816/)##Table of Contents:* Preface * Chapter 1: Shell Something Out* Chapter 2: Have a Good Command* Chapter 3: File In, File Out##说明> 本文为书摘，例子多为在原书基础上的修改，为了让篇幅不太庞大，例子尽量缩为一行，使书 阅读全文