通过从UNIX命令行运行单命令行程序，可以利用多种有意义和复合的方式(无需编辑器)对文本文件进行编辑。

Text files can be edited in significant and complex ways without an editor by running one-liners from the UNIX command line.

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虽然这个单命令行程序非常简单，但是它的缺点在于创建了一个新文件。

Although it's simple, the disadvantage of this one-liner is that it creates a new file.

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对于脚本中的特别单命令行程序，可以使用 echo 将一组命令和文本管道传输给 ed，从而以非交互式的方式使用它。

For ad hoc one-liners in scripts, use ed noninteractively by piping a group of commands and text to it with echo

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