C-x is cut. C-v is paste. C-a C-x C-s cuts everything to clipboard and saves an empty file. C-v C-s would restore this. So C-a C-x C-s C-v C-s is just a fun

C-x is cut. C-v is paste. C-a C-x C-s cuts everything to clipboard and saves an empty file. C-v C-s would restore this. So C-a C-x C-s C-v C-s is just a funny way of saying C-s.