import os
print("mini command line v1.0.0")
print("type help for a list of commands.")
print("")

def commandline():
    commandline = input("C:\\system\\commands>")
    return commandline

commands = ["help", "dir", "exit"]

commandline_string = ""
while commandline_string != "exit":
    commandline_string = commandline()

    if not commandline_string in commands and commandline_string != "":
        print("Unable to run command. Please check that the command exists and that you have permission to use it.")

    if commandline_string == "help":
        print("These are the valid commands")
        for command in commands:
            print(command)

    elif commandline_string == "dir":
        files = os.listdir("/")
        for file in files:
            print(file)

    elif commandline_string == "dir /?":
        print("the dir command will display your computer directories.")

    elif commandline_string == "exit /?":
        print("the exit command will exit the XC command line command interpreter.")