How do I duplicate the current line to the end of the file without yanking or moving the cursor?
:.t$
The Ex command :.
Tag: copy
How do I copy a character from the line directly above or below while staying in insert mode?
<C-y> and <C-e>
In Insert mode, copies the character at the same column position from the line above the cursor, and copies the character from the line below.
How do you copy a range of lines to another location?
:10,15t 25
Use :t (copy) with a range and destination.
How do you record a macro to copy lines matching a pattern to end of file?
qa/pattern\nyy}pq
Record a macro that searches for a pattern, yanks the matching line, goes to the end of the paragraph, and pastes it.