1. What is Command?

Ans: A command is an instruction given by a user telling a computer to do something, such a run a single program or a group of linked programs.

2. Why we use command?

Ans: Using command we can tell a  computer what we want to do. We can do tasks easily by using commands.

3.   How can we find detail information of any command?

ans: Using "man" command.

4.   List all essential "file" commands with it's use .

Ans: