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The virtual terminals support some ANSI escape sequences.
By default, the keyboard input is NOT echoed to the screen.
Keyboard echoing can be enabled by sending 0x1b[e and disabled by sending 0x1b[h.
When keyboard echo is enabled:
- what is written to keyboard is echoed ONLY IF A PROCESS IS CURRENTLY READING THE INPUT
- escape sequences are ignored (arrows, commands, etc.)
- backspaces are taken into account, so that they don't need post-processing
- read returns when a newline is read from keyboard
When keyboard echo is disabled:
- what is written to keyboard is NEVER ECHOED
- read returns after each keystroke (can also be an escape sequence)
Default is keyboard echo disabled.
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