如果字符串中有点，则如何grep查找确切的单词

Question

我试图在当前目录中搜索特定单词BML.I

当我尝试使用以下命令时：

grep -l  "BML.I" *

如果它包含单词BML它将显示所有结果

是否可以grep完全匹配BML.I

Answer 1

你需要逃避。 （句点）因为默认情况下它与任何字符匹配，并指定-w以匹配特定的单词，例如

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

注意上面有两个级别的转义。 引号确保shell将BML\\.I传递给grep。 \\然后逃脱了grep的时期。 如果省略引号，则shell将\\解释为句点的转义（并且只是将未转义的句点传递给grep ）

Answer 2

试试grep -wF

来自手册页：

 -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 ，它与grep -F相同

Answer 4

使用此命令：

ls | grep -x "BML.I"