我正在刷新一个命令的输出，我只想返回特定的，严格的结果。
我记得grep的一些迭代有一个严格的选项-s / --strict 。
例如， grep -s bytes只会返回提及单词“bytes”的条目，而不是每个包含字节的单词，如“兆字节”，“千字节”等。
-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 con- stituent character. Word-constituent characters are letters, digits, and the underscore.