hello-custom.go

package cmd

import (
	"fmt"

	"github.com/spf13/cobra"
)

var name string
var helloCmd = &cobra.Command{
	Use:   "hello",
	Short: "Say hello to anyone!",
	Long:  "Say hello to the world & anyone!",
	Run: func(cmd *cobra.Command, args []string) {
		fmt.Printf("Hello, %s!\n", name)
	},
}

func init() {
	helloCmd.Flags().StringVarP(
		&name,
		"name",
		"n",
		"World",
		"The name you want to say hello to!",
	)
}