package main

import (
	"fmt"
	"os"
	"path"
)

func usage() {
	fmt.Printf("usage: %v path\n", os.Args[0])
	os.Exit(1)
}

func main() {
	if len(os.Args) != 2 {
		usage()
	}

	fmt.Println(path.Dir(os.Args[1]))
}