bash grep 区分大小写 [AZ]？
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grep case sensitive [A-Z]?
提问by Steven Penny
I cannot get grepto case sensitivesearch with this pattern
我无法使用此模式grep进行区分大小写的搜索
$ grep 'T[A-Z]' test.txt
The Quick Brown Fox Jumps Over The Lazy Dog
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG
采纳答案by Paused until further notice.
Use quotes to prevent the pattern from being matched as a glob to file(s) in the filesystem by the shell. ''
使用引号防止模式被 shell 匹配为文件系统中的文件。 ''
Use a named character class to guarantee a case-sensitive match. [[:lower:]]
使用命名字符类来保证区分大小写的匹配。 [[:lower:]]
Use a quantifier to make matches for more than one character. \+
使用量词匹配多个字符。 \+
Use anchor(s) to make sure the match is positioned properly. ^
使用锚点来确保匹配位置正确。 ^
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.
[A-Z]对您不起作用的原因是您使用的语言环境在您的系统上实现的方式，该模式还包括小写字母。
回答by Steven Penny
You can set LANG value:
您可以设置 LANG 值：
$ LANG=C grep 'T[A-Z]' test.txt
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG
回答by Nahuel Fouilleul
grep 'T[[:upper:]]' test.txt
grep 'T[ABCDEFGHIJKLMNOPQRSTUVWXYZ]' test.txt
