ANSI escape code


 * Wikipedia page
 * Escape sequence.
 * VT100/VT52 escape sequence.
 * Using bash to test escape codes.

CSI

 * Control Sequence Introductor
 * Esc + [ is used in UTF-8 environment or 7-bit char environment.
 * 0x9B is the single char corresponding to CSI. Though it won't be used than Esc + [.