grep egrep多个字符串 [英] grep egrep multiple-strings

问题描述

假设我有几个字符串：str1和str2以及str3。

• 如何查找包含所有字符串的行？
>

• 如何查找可以包含其中任何一行的行


• 以及如何查找包含str1和str2和str3的行[这两个？]？

解决方案

将这些表达式放在一起最简单的方法是使用多个管道。毫无耻辱，特别是因为正常表达式（使用 egrep ）会很笨拙，因为你看起来这意味着你想要订单独立性。

因此，按顺序，

1. grep str1 | grep str2 | grep str3




2. egrep'（str1 | str2 | str3）'




3. grep str1 | egrep'（str2 | str3）'

您可以使用egrep以独立方式执行and ，但我认为你会发现使用管道greps和独立命令或使用正则表达式来记住使用独立命令和命令更容易。

Suppose I have several strings: str1 and str2 and str3.

• How to find lines that have all the strings?
• How to find lines that can have any of them?
• And how to find lines that have str1 and either of str2 and str3 [but not both?]?

解决方案

This looks like three questions. The easiest way to put these sorts of expressions together is with multiple pipes. There's no shame in that, particularly because a regular expression (using egrep) would be ungainly since you seem to imply you want order independence.

So, in order,

1. grep str1 | grep str2 | grep str3

2. egrep '(str1|str2|str3)'

3. grep str1 | egrep '(str2|str3)'

you can do the "and" form in an order independent way using egrep, but I think you'll find it easier to remember to do order independent ands using piped greps and order independent or's using regular expressions.

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