Design and implement a simple, interactive shell program that prompts the user for a command, parses the command, and then executes it with a child process. in your solution you are required to use which means that you will have to read the path environment, then search each directory in the path for the command file name that appears on the command line.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.