Command-line arguments revisited!

As we saw in Chapter 2, Writing Programs in Go, you cannot work efficiently with multiple command-line arguments and options using if statements. The solution to this problem is to use the flag package, which will be explained here.

Remembering that the flag package is a standard Go package and that you do not have to search for the functionality of a flag elsewhere is extremely important.

The flag package

The flag package does the dirty work of parsing command-line arguments and options for us; so, there is no need for writing complicated and perplexing Go code. Additionally, it supports various types of parameters, including strings, integers, and Boolean, which saves you time as you do...