Logging fatal errors

Using the log package, we can also log fatal errors. The Fatal(), Fatalf(), and Fatalln() functions are similar to Print(), Printf(), and Println(). The difference is after logging, Fatal() functions are followed by an os.Exit(1) system call. The log package also has the following functions: Panic, Panicf, and Panicln. The difference between the Panic functions and the Fatal functions is that the Panic functions are recoverable. When using the Panic functions, you can use the defer() function, whereas when using the Fatal functions, you cannot. As stated earlier, the Fatal functions call os.Exit(); a defer function will not be called when os.Exit() gets called. There may be some instances where you want to abort the program immediately with no possibility of recovery. For example, the application may have gotten to a state where it is best to exit it before data corruption or undesired behavior results. Or, you may have developed a command-line utility that is...