Create a Shell Script: Write a program which performs  two functions:             add             sub   The function add, ads two numbers and the function sub subtracts two numbers. Prompt the user for two numbers and whether they want to add or subtract. Perform the operation requested by the user and display the results. Requirements: Validate user input: If the user types a value that is not what was prompted for, print a message and return to prompting the user for the two numbers and the type of operation requested The script must run without errors regardless of what the user inputs Extra credits for writing and using shell script functions in the program Use of man pages is encouraged

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.