ANSI Escape Code - Invalid and Ambiguous Sequences in Use

Invalid and Ambiguous Sequences in Use

  • The Linux console uses OSC P n rr gg bb to change the palette, which, if hard-coded into an application, may hang other terminals. However, appending ST will be ignored by Linux and form a proper, ignorable sequence for other terminals.
  • On the Linux console, certain function keys generate sequences of the form CSI [ char. The CSI sequence should terminate on the [.
  • Old versions of Terminator generates SS3 1; modifiers char when F1–F4 are pressed with modifiers. The faulty behavior was copied from GNOME Terminal.
  • xterm replies CSI row ; column R if asked for cursor position and CSI 1 ; modifiers R if the F3 key is pressed with modifiers, which collide in the case of row == 1. This can be avoided by using the ? private modifier, which will be reflected in the response.
  • many terminals prepend ESC to any character that is typed with the alt key down. This creates ambiguity for uppercase letters and symbols @^_, which would form C1 codes.
  • Konsole generates SS3 modifiers char when F1–F4 are pressed with modifiers.

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