[Help-bash] How to escape the format string used by printf?

[Peng Yu]

Hi,

For any string, I need to use it literately in `format` of `printf`.

printf: printf [-v var] format [arguments]

Certain things, for example, %, must be escaped.

Is there a builtin or well-tested way to efficiently and correctly
escape any string so that they can be used as `format` of `printf`
literally? Thanks.

-- 
Regards,
Peng