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* The ECHO feature causes each key you type to be printed to the terminal, so you can see what you’re typing.
* Terminal attributes can be read into a termios struct by tcgetattr().
* After modifying them, you can then apply them to the terminal using tcsetattr().
* The TCSAFLUSH argument specifies when to apply the change: in this case, it waits for all pending output to be written to the terminal, and also discards any input that hasn’t been read.