For the equivalent of vi's 'yyp', you must do C-a C-k C-k C-y C-y, or more likely 'C-akkyy'. The first C-k only kills to end-of-line, to capture the line endin

For the equivalent of vi's 'yyp', you must do C-a C-k C-k C-y C-y, or more likely 'C-akkyy'. The first C-k only kills to end-of-line, to capture the line ending (\n) you need another C-k. The first C-y only puts back what you killed, so that needs to be doubled also to actually change the buffer in the desired way. Subsequent C-y commands will add more copies of the line, but I find that 99% of the time it's only a single duplicate of a line that I want. C-S-Backspace C-yy does the same thing, btw.