I've noticed that man pages and other documents formatted by Unix utilities often use double backticks
`` followed by double single quotes
'' to wrap quoted phrases instead of the double quote character
". Single quotes are similarly replaced. Why is this?
Here are a couple examples, from the man page for
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 1003.1-2008 (``POSIX.1'') specification.