Retrieving Variable Declaration

Question

How can I find how did I first declare a certain variable when I am a few hundred lines down from where I first declared it. For example, I have declared the following:

Answer 1

You can run grep 'a<-' .Rhistory from terminal (assuming that you've cdd to your working directory). ESS has several very useful history-searching functions, like (comint-history-isearch-backward-regexp) - binded to M-r by default.

For further info, consult ESS manual: http://ess.r-project.org/Manual/ess.html