Guideline 10:
    The first -- argument that is not an option-argument should be accepted as a delimiter indicating the end of options. Any following arguments should be treated as operands, even if they begin with the '-' character.

// main.go
package main

import (
	"fmt"
	"os"
	"os/exec"
	"strings"

	"github.com/spf13/cobra"
)

func main() {
	rootCmd := &cobra.Command{Use: "mycli"}
	rootCmd.AddCommand(echoCmd())
	if err := rootCmd.Execute(); err != nil {
		os.Exit(1)
	}
}

func echoCmd() *cobra.Command {
	var shout bool

	cmd := &cobra.Command{
		Use:   "echo",
		Short: "Pass arguments to the echo command",
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Println("Flag --shout:", shout)
			fmt.Println("Args to echo:", args)

			if shout {
				for i, v := range args {
					args[i] = strings.ToUpper(v)
				}
			}

			// Run echo with args
			out, err := exec.Command("echo", args...).CombinedOutput()
			if err != nil {
				fmt.Println("Error:", err)
				return
			}
			fmt.Println("Output:", string(out))
		},
	}

	cmd.Flags().BoolVar(&shout, "shout", false, "Uppercase all args")
	return cmd
}

go mod init mycli
go mod tidy
go run main.go echo --shout -- hello world

Flag --shout: true
Args to echo: [hello world]
Output: HELLO WORLD