From Building a CLI application in Go

• go.mod - Go Modules file used in Go for package management
• main.go - Main entrypoint of the application
• comic.go - Go representation of the data as a struct and operations on it
• xkcd.go - xkcd client for making HTTP calls to the API, parsing response and saving to disk

Run the program as follows-

$ go run main.go -n 323 -o json

Or build it as an executable binary for your laptop and then run-

$ go build .
$ ./go-grab-xkcd -n 323 -s -o json