UNIX systems programming Unit 1 IP

The first script that needs to be written is automating the shutdown procedure. Write a script that will perform the following tasks:Prompt the system administrator for all valid input parameters.Ask if a wall needs to be sent, and if yes, send the message.Ask if this is a shutdown or reboot, and process appropriately.In addition, take this opportunity to describe the various UNIX run levels, what each level is used for, and how to boot to a specificrun level.The scripts must run correctly and Must be APA formated with references and double spaced