Today I Learnt that, you can use
:t.
to duplicate the line on which your cursor is present
Use case
Usually, when working with existing code [ to either trace through the code, or debug it ] I would use the following keys to duplicate the current line on which my cursor is present
yyp
But now, with vim :t., its much easier
Helpful Tip
Recently, I was updating my log book where each line refers to works done on each day
Every day, a new entry gets added at the end of file.
While adding the data for today, I noticed that the data that I needed was already present in a line written 5 lines above the last line of the file
So, I moved the cursor to the existing line and typed
:t$
To duplicate the present line to the end of the file.