1. What is Command?
Ans: a command is a directive to a computer program to perform a specific task.
2. Why we use a command?
Ans: In computing, a command is a directive to a computer program to perform a specific task. It may be issued via a command-line interface, such as a shell, or as input to a network service as part of a network protocol, or as an event in a graphical user interface triggered by the user selecting an option in a menu.
3. How can we find detail information of any command?
Ans:
The user command displays the user account attributes. You can use this command to list all attributes of all the system users or all the attributes of specific users.