sed -E和sedee之间有什么区别？ [英] Whats the difference between sed -E and sed -e

问题描述

我正在处理一些旧的代码，我发现我曾经使用

I'm working on some old code and I found that I used to use

sed -E 's/findText/replaceWith/g' #findText would contain a regex

但我现在尝试

sed -e 's/findText/replaceWith/g'

似乎做同样的事情，还是做？
我记得有一个理由我做了它，但我不记得和做男人sed没有帮助，因为他们没有什么关于 - 只有 - 这并不太有意义以太网。

It seems to do the same thing, or does it? I kinda remember there being a reason I done it but I can't remember and doing "man sed" doesn't help as they don't have anything about -E only -e that doesn't make much sense ether.

-e, --expression=script
  Append the editing commands in script to the end of 
  the editing command script. script may contain more 
  than one newline separated command.

我以为 - 这意味着它会与正则表达式匹配...

I thought -e meant it would match with a regex...

GNU sed version 4.2.1

推荐答案

从源代码中， -E 是一种与BSD sed兼容的无证选项。

From source code, -E is an undocumented option for compatibility with BSD sed.

/* Undocumented, for compatibility with BSD sed.  */
case 'E':
case 'r':
  if (extended_regexp_flags)
    usage(4);
  extended_regexp_flags = REG_EXTENDED;
  break;

而从手册，BSD中的 -E sed用于支持扩展正则表达式。

And from manual, -E in BSD sed is used to support extended regular expressions.

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