ASCII

VT100 Escape Code

http://www.climagic.org/mirrors/VT100_Escape_Codes.html

All the code starts from ^[, this is ASCII code for ESC, so they are called escape code. ESC has decimal value of 27. So in C, sending it is like:

printf("%c[2K", 27);
printf("\33[2K");

[2k suffix identify the code "clean the line", so the printf will clean the line. It is equivalent to send \33[2K. Note that it only clean the line, in order to overwrite the text you need to make the cursor to the beginning by \r.

Use only \r without cleaning the line will have trouble if the previous line is longer than the new line.

Some code might be interesting:

#+END_EXAMPLE