telnet流未知转义码

Question

I have a task that involves parsing telnet stream. All works well until my client receives unknown to me escape sequence ESC[15X . I have checked many documents explaining what do escape codes mean and should do, but none of them contained the one mentioned. When I test the escape code in terminal window it seems to not do anything. If anyone has a clue or knows where to look it up, it would help me greatly.

Answer 1

That is used to erase characters. XTerm Control Sequences lists it:

CSI Ps X  Erase Ps Character(s) (default = 1) (ECH).

where

ESC [
     Control Sequence Introducer (CSI  is 0x9b).

It was introduced by DEC VT220, and is supported in xterm and a few other terminal emulators.