Question: User Name Write a program that queries its environment, determines the users login name, and then greets the user by name. For example, if the

User Name Write a program that queries its environment, determines the users login name, and then greets the user by name. For example, if the login name of the user is gcm, then the program prints Hello, gcm when it is executed.

Write a short description of each of the following functions:

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