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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/

// See page 33.
//!+

// Echo4 prints its command-line arguments.
package main

import (
    "flag"
    "fmt"
    "strings"
)

var n = flag.Bool("n", false, "omit trailing newline")
var sep = flag.String("s", " ", "separator")

func main() {
    flag.Parse()
    fmt.Print(strings.Join(flag.Args(), *sep))
    if !*n {
        fmt.Println()
    }
}

//!-