urfave-cli/docs/v2/examples/exit-codes.md

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v2	boost 2

Calling App.Run will not automatically call os.Exit, which means that by default the exit code will "fall through" to being 0. An explicit exit code may be set by returning a non-nil error that fulfills cli.ExitCoder, or a cli.MultiError that includes an error that fulfills cli.ExitCoder, e.g.:

package main

import (
	"log"
	"os"

	"github.com/urfave/cli/v2"
)

func main() {
	app := &cli.App{
		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:  "ginger-crouton",
				Usage: "is it in the soup?",
			},
		},
		Action: func(ctx *cli.Context) error {
			if !ctx.Bool("ginger-crouton") {
				return cli.Exit("Ginger croutons are not in the soup", 86)
			}
			return nil
		},
	}

	if err := app.Run(os.Args); err != nil {
		log.Fatal(err)
	}
}