How do you use a macro to append a comma to every line?
Answer
qaA,<Esc>jq
Explanation
Record a macro that moves to end of line with A, types a comma, escapes to normal mode, and moves down. Run with 999@a.
qaA,<Esc>jq
Record a macro that moves to end of line with A, types a comma, escapes to normal mode, and moves down. Run with 999@a.