At least once per day i have the following situation:

A: This line should also replace line X
...
X: This is line should be replaced

I believe that I don't perform that task efficiently.

What I do:

• Go to line A: AG
• Yank line A: yy
• Go to line X: XG
• Paste line A: P
• Move to old line: j
• Delete old line: dd

This has the additional disadvantage that line X is now in the default register, which is annoying if I find another line that should be replaced with A. Yanking to and pasting from an additional register ("ayy, "aP) makes this simple task even less efficient.

My Questions:

• Did I miss a built-in Vim command to replace a line yanked before?
• If not, how can I bind my own command that leaves (or restores) the yanked line in the default register?