详细介绍了如何用shell逐行读取文件内容，（当然你可以读取每行做其他的处理），本文实现了shell逐行读取文件的8种方法，并且比较这些方法的时间优越性。-Described in detail how to use shell to read the content of the document line by line, (Of course, you can read each line to do other treatment), this article has read the document line by line shell of eight kinds of methods, and comparative advantages of these methods the time.