grep的区分大小写[A-Z]？ [英] grep case sensitive [A-Z]?

问题描述

我不能让的grep 为区分大小写此模式搜索

  $的grep'T [A-Z]的test.txt
敏捷的棕色狐狸跳过了懒狗
敏捷的棕色狐狸跳过了懒狗
 

解决方案

使用引号prevent被匹配在由外壳文件系统中的水珠到文件（S）模式。

使用指定的字符类，以保证区分大小写的匹配。 [：降低：]]

使用量词，使比赛为多个字符。 \\ +

使用锚（S），以确保比赛的正确定位。 ^

 的grep'^ T [：上：]] \\ +'的test.txt
 

之所以 [AZ] 工作不适合你的是，你正在使用的语言环境是您的系统上实现的方式，该模式还包括小写字母

I cannot get grep to case sensitive search with this pattern

$ grep 'T[A-Z]' test.txt
The Quick Brown Fox Jumps Over The Lazy Dog
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG

解决方案

Use quotes to prevent the pattern from being matched as a glob to file(s) in the filesystem by the shell. ''

Use a named character class to guarantee a case-sensitive match. [[:lower:]]

Use a quantifier to make matches for more than one character. \+

Use anchor(s) to make sure the match is positioned properly. ^

grep '^T[[:upper:]]\+' test.txt

The reason that [A-Z] isn't working for you is that the way the locale you're using is implemented on your system, that pattern also includes lowercase letters.

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