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CcVHKakalLLOOPPOkKkkKk
Asked: 2019-06-14 21:37:37 +0800 CST

grep -w 有什么作用？

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在这里grep 与选项一起使用-w。我做了man grep并grep --help试图找到上述选项的作用。两个输出都没有说明-w选项。

该选项有什么作用？为什么它没有出现在manor中--help？如果类似的事情再次发生，我还能在哪里检查答案？

我目前正在使用 Ubuntu，如果相关的话（是吗？）

grep man

2 个回答

  1. Best Answer
    # grep --help | grep -e -w
  -w, --word-regexp         force PATTERN to match only whole words
  -H, --with-filename       print file name with output lines
  -L, --files-without-match  print only names of FILEs with no selected lines
  -l, --files-with-matches  print only names of FILEs with selected lines
# grep PRETTY /etc/os-release
PRETTY_NAME="Ubuntu 18.04 LTS"
# man grep | grep -e -w -A1
       -w, --word-regexp
              Select only those lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent  character.   Similarly,  it
              must be either at the end of the line or followed by a non-word constituent character.  Word-constituent characters are letters, digits, and the underscore.
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  2. -w, --word-regexp 仅选择那些包含构成整个单词的匹配项的行。测试是匹配的子字符串必须在行首，或者前面有一个非单词组成字符。同样，它必须位于行尾或后跟非单词组成字符。构成单词的字符是字母、数字和下划线。

    来源：https ://linux.die.net/man/1/grep

    • 1

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