Powerful Command-Line Applications in Go

Adding the First Subcommand to Your Application

After initializing the application, use the Cobra generator to add subcommands to it. The generator includes a file in the cmd directory for each subcommand. Each file includes boilerplate code for the subcommand. It also adds the subcommand to its parent, forming the tree-like structure.

Add a new subcommand called hosts to your application to manage hosts in the hosts list. By default, Cobra adds this subcommand to the root command:

$ cobra add hosts
Using config file: /home/ricardo/.cobra.yaml
hosts created at /home/ricardo/pragprog.com/rggo/cobra/pScan

At this point, your application directory looks like this:

$ tree
.
├── cmd
│   ├── hosts.go
│   └── root.go
├── ...