sed (意为流编辑器，源自英语“stream editor”的缩写)是Unix常见的命令行程序。sed 用来把文档或字符串里面的文字经过一系列编辑命令转换为另一种格式输出。sed 通常用来匹配一个或多个正则表达式的文本进行处理。
sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline). While in some ways similar to an editor which permits scripted edits (such as ed), sed works by making only one pass over the input(s), and is consequently more efficient. But it is sed's ability to filter text in a pipeline which particularly distinguishes it from other types of editors.
09/06/10 linux sed 学习笔记 Linux sed的学习の続きを見る