如果字符串已經有點，grep的確切單詞

Question

我試圖搜索當前目錄中的特定單詞BML.I。

當我用下面的命令嘗試：

grep -l "BML.I" * 

它顯示了所有的結果，如果它包含單詞BML

是否有可能到grep的精確匹配BML.I

Answer 1

你需要逃避的。 （句點），因爲默認情況下它與任何字符匹配，並指定-w以匹配特定的詞，例如

grep -w -l "BML\.I" * 

注意上面有兩級轉義。引號確保shell將BML\.I傳遞給grep。然後\轉義爲grep。如果省略了引號，然後殼解釋\作爲期間逃逸（並會簡單地傳遞轉義期間grep）

Answer 2

嘗試grep -wF

從手冊頁：

-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. 



-F, --fixed-strings 
       Interpret PATTERN as a list of fixed strings, separated by newlines, any 
       of which is to be matched. (-F is specified by POSIX.) 

Answer 3

我使用fgrep，與grep -F相同