Linux echo命令的使用及三种实现方式

// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
package main
import (
  "fmt"
  "os"
)
func main() {
  var s, sep string
  for i := 1; i < len(os.Args); i++ {
    s += sep + os.Args[i]
    sep = " "
  }
  fmt.Println(s)
}

package main
import (
  "fmt"
  "os"
)
func main() {
  s, sep := "", ""
  for _, arg := range os.Args[1:] {
    s += sep + arg
    sep = " "
  }
  fmt.Println(s)
}

package main
import (
  "fmt"
  "os"
  "strings"
)
//!+
func main() {
  fmt.Println(strings.Join(os.Args[1:], " "))
}