While of the Linux script instance

Write a script that, after execution, prints a line that says "Please input a number:", asks the user to enter a value, prints out the value, and then asks the user to enter the value again. Until the user enters "end" to stop

Description: 1.unset num can or do not unset the role is to cancel the variable settings, to prevent the previous value of the impact of the script program

2.if statement Notice that there is a space between the IF and the condition. There are spaces in the condition with the brackets on each side

3.echo-n do not wrap the line automatically

Operation Result:

While of the Linux script instance