标志：`Head -1` 风格

package main
 
import (
	"context"
	"os"
 
	"github.com/hedzr/cmdr/v2"
	"github.com/hedzr/cmdr/v2/cli"
	"github.com/hedzr/cmdr/v2/examples"
	logz "github.com/hedzr/logg/slog"
)
 
const (
	appName = "head-like"
	desc    = `a sample to show u how to build a facade like "head -123".`
	version = cmdr.Version
	author  = ``
)
 
func main() {
	app := cmdr.Create(appName, version, author, desc).
		With(func(app cli.App) {}).
		WithBuilders(examples.AddHeadLikeFlag).
		WithAdders().
		Build()
 
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
 
	if err := app.Run(ctx); err != nil {
		logz.ErrorContext(ctx, "Application Error:", "err", err) // stacktrace if in debug mode/build
		os.Exit(app.SuggestRetCode())
	} else if rc := app.SuggestRetCode(); rc != 0 {
		os.Exit(rc)
	}
}