Reverse Index (RI)

This sequence does not unset the pending wrap state.

If the cursor is exactly on the top margin and is within left and right margins, invoke scroll down (SD) with n = 1. The operation is complete.

Otherwise, scrolling isn't necessary. Perform a cursor up operation with n = 1.

printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "A\n"
printf "B\n"
printf "C\n"
printf "\033[1;1H" # move to top-left
printf "\033M" # reverse index
printf "X"

|Xc________|
|A_________|
|B_________|
|C_________|

printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "A\n"
printf "B\n"
printf "C\n"
printf "\033[2;1H"
printf "\033M" # reverse index
printf "X"

|Xc________|
|B_________|
|C_________|

printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "A\n"
printf "B\n"
printf "C\n"
printf "\033[2;3r" # scroll region
printf "\033[2;1H"
printf "\033M" # reverse index

|A_________|
|c_________|
|B_________|

printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "A\n"
printf "B\n"
printf "C\n"
printf "\033[2;3r" # scroll region
printf "\033[1;1H"
printf "\033M" # reverse index

|A_________|
|B_________|
|C_________|

printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "ABC\n"
printf "DEF\n"
printf "GHI\n"
printf "\033[?69h" # enable left/right margins
printf "\033[2;3s" # scroll region left/right
printf "\033[1;2H"
printf "\033M"

|A_________|
|DBC_______|
|GEF_______|
|_HI_______|

printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "ABC\n"
printf "DEF\n"
printf "GHI\n"
printf "\033[?69h" # enable left/right margins
printf "\033[2;3s" # scroll region left/right
printf "\033[2;1H"
printf "\033M"

|ABC_______|
|DEF_______|
|GHI_______|

Cursor on the A.