grep '\<hi\>' coco.txt和之间有什么区别grep 'hi' coco.txt？我在终端中应用了这些命令，但是看不到任何区别。
在grep，\<代表字的开头和\>代表字的结束。
来自man grep：
The Backslash Character and Special Expressions
The symbols \< and \> respectively match the empty string at the
beginning and end of a word. The symbol \b matches the empty string at
the edge of a word, and \B matches the empty string provided it's not
at the edge of a word. The symbol \w is a synonym for [_[:alnum:]] and
\W is a synonym for [^_[:alnum:]].
因此，grep '\<hi\>'将匹配包含单词的任何行hi，grep 'hi'并将匹配包含字符序列的任何行hi：
$ grep '\<hi\>' <<< "hi"
hi
$ grep '\<hi\>' <<< "chimes"
$ # no output since no match
$ grep '\<hi\>' <<< "hi-fi"
hi-fi
$ grep '\<hi\>' <<< "high voltage"
$ # no output since no match
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