我注意到由 Unix 实用程序格式化的手册页和其他文档通常使用双反引号``后跟双单引号''来包装带引号的短语而不是双引号字符"。单引号同样被替换。为什么是这样？
以下是来自手册页的几个示例grep：
To find all occurrences of the pattern `.Pp' at the beginning of a line:
$ grep '^\.Pp' myfile
The apostrophes ensure the entire expression is evaluated by grep instead
of by the user's shell. The caret `^' matches the null string at the
beginning of a line, and the `\' escapes the `.', which would otherwise match
any character.
The grep utility is compliant with the IEEE Std …