grep模式单引号和双引号

问题描述

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将 grep 模式包含在单引号和双引号之间是否有区别?

Is there any difference between enclosing grep patterns in single and double quotes?

grep "abc" file.txt

和

grep 'abc' file.txt

我要问的是，因为我无法独自测试所有可能的情况，而且我不想偶然发现我弄错了的情况:)

I'm asking since there's no way I could test all possible cases on my own, and I don't want to stumble into a case that I get wrong :)

推荐答案

如果您有特殊字符，我会发现有所不同:

I see a difference if you have special characters :

Ex:

grep "foo$barbase" file.txt

shell会尝试扩展变量 $ barbase ，这可能不是您想要的.

The shell will try to expand the variable $barbase, this is maybe not what you intended to do.

相反，您键入

grep 'foo$barbase' file.txt

$ bar 是按字面意思.

最后，默认情况下始终首选单引号，这样会更强.

Finally, always prefer single quotes by default, it's stronger.

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