How to locate a file quickly

Wincent  <ronggui.huang at gmail.com>
    on Mon, 10 Dec 2012 15:15:34 +0800 writes:

> Dear all,
    > During the development of R packages, more and more functions are written
    > and some of them are placed in a file. After a while, I want to revised a
    > function, but forget which file the function is in. Is there a recommended
    > way of locate a function quickly?

why do you think this belongs to R-devel ?

Please use  R-help  for such questions.

Best regards,
Martin