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 TTY is basically known as teletypewriter also known as terminal It is an interface to run Linux/Unix based commands You can always find multiple number of TTY in your System Whenever you run a command in your Linux/Unix Systems you need to provide input through the terminal and then you get the output in the same terminalTo find out which tty's are attached to which processes use the "ps a" command at the shell prompt (command line) Look at the "tty" column For the shell process you're in, /dev/tty is the terminal you are now using Type "tty" at the shell prompt to see what it is (see manual pg tty(1)) /dev/tty is something like a link to the actually terminal device name with some additional Once it detects a connection, it opens a tty port, asks for a user's login name and calls up the /bin/login command Agetty is a substitute of Linux getty $ agetty L 9600 ttyS1 vt100 alias Command alias is a useful shell builtin command for creating aliase...