Write a program for UNIX or XP that takes as input the name of a directory. The program should print a list of the files in the directory, one line per file, and after the file name, print the size of...

Write a program for UNIX or XP that takes as input the name of a directory. The program should print a list of the files in the directory, one line per file, and after the file name, print the size of the file. Print the file names in the order they occur in the directory. Unused slots in the directory should be listed as (unused).