Greeter application Listing 1.1 Listing 1.2 Listing 1.3 Listing 1.4 Greeter application with flags Listing 1.5 Listing 1.6 Test for runCmd() function Test for validateArgs() function Greeter application with flags, positional arguments with additional user interface enhancements Listing 1.7 Listing 1.8 Listing 1.9 Test for validateArgs() function