5. Provide a list of 3 (or more) regular filenames (not directories) on the command line to your program. One should be in the current directory, one should be a relative file reference to a file in another directory and the third should be an absolute file reference in a completely different directory. You can use any Unix directory under / but not in the root directory itself. Use realpath, dirname and basename to print out the full path of each file, the directory it occurs in and the name of the file without the directory itself. (Warning make a copy of the result of realpath as the textbook warns that dirname will alter the string