Terminals

• This thing to the right is a teletypewriter, or tty for short

• Unix terminals are called "ttys" to this day:

         % tty
         /dev/pts/2

         % echo foo >> /dev/tty
         foo

         % stty columns 132
         %
         

• There used to be a system error called ENOTTY

• This was issued when you tried to use a tty device command a non-tty device

• It produced the following mysterious message:

         % stty columns 132 < /dev/null
         stty: Not a typewriter

• Recent systems have changed this to Inappropriate ioctl for device

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