io/ioutilパッケージを使ってパイプで繋いだ標準出力から文字列を受け取る

実際のところ

package main

import (
	"fmt"
	"io/ioutil"
	"os"
)

func main() {
	stat, _ := os.Stdin.Stat()
	if (stat.Mode() & os.ModeCharDevice) == 0 {
		fmt.Println("data is being piped to stdin")

		bytes, err := ioutil.ReadAll(os.Stdin)
		if err != nil {
			fmt.Printf("We got error on os.Stdin")

		} else {
			fmt.Println(string(bytes))
		}

	} else {
		fmt.Println("No stdin pipe")
	}
}

$ go run samplescript.go 
No stdin pipe

$ echo "hoge" | go run samplescript.go 
data is being piped to stdin
hoge

参考もと

Read from initial stdin in GO? - Stack Overflow

go - Check if there is something to read on STDIN in Golang - Stack Overflow