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tty1. Short for TeleTYpewriter or TeleTYpe, TTY is an electronic typewriter or teleprinter that has a keyboard and a printer. Each time a key is pressed, it would be printed to paper like a typewriter. Later, modern TTY machines also print to a screen. Teleprinters were widely used in the late 1800's and early 1900's and today have been replaced by computers with keyboards.

TTY modes

Teletype machines were available in three different modes shown below.

  • Automatic Send and Receive (ASR) -- Able to send and receive.
  • Receive Only (RO) -- only capable of receiving data and not sending.
  • Keyboard Send and Receive (KSR) -- TTY with keyboard capable of sending and receiving data.

2. Today, TTY is used to describe a terminal session or line. Users who are using Linux may view a process or which users are logged in by typing a tty, such as ttyx, where x is any numerical value. For example, tty1, tty2, tty3, tty4, tty5, tty6, tty7, and so on.

Also see: CTTY, Device name, Keyboard terms, Ptm, Pts, Pty, PuTTY, TDD, Teleprinter