Explanation : /dev/tty is a synonym for the terminal you are currently using.
If echo welcome >/dev/tty, is a part of a shell. welcome will be echoed in the terminal in which the script is run, doesn't matter which terminal it is.
Explanation : /dev/null can be called UNIX built-in dust-bin. To prevent a program from filling the monitor with garbage.
/dev/null comes in handy. Just redirect it to /dev/nul1. It
gladly accepts garbage. It is a universal sink.
5:
The advantage of binary files over text files is that