## Homework

 1. Write a C program, ‹user.c›, which does the following:
    
    a. if given an argument, that argument is a user name
    b. print the numeric id of that user
    c. print the numeric id of the primary group of the user
    d. print the name of the primary group of the user
    e. if no argument is given, print the name of the current user,
       along with c. and d.
    
 2. You can use any of: ‹getpwent›, ‹getpwnam›, ‹getpwuid›,
    ‹getgrent›, ‹getgrnam› and ‹getgrgid›.

 3. Print each piece of info on a separate line, with no extra text.
