stdERR.go

package main

import (
    "io"
    "os"
)

func main() {
    myString := ""
    arguments := os.Args
    if len(arguments) == 1 {
        myString = "Please give me one argument!"
    } else {
        myString = arguments[1]
    }

    io.WriteString(os.Stdout, "This is Standard output\n")
    io.WriteString(os.Stderr, myString)
    io.WriteString(os.Stderr, "\n")
}

stdIN.go

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    var f *os.File
    f = os.Stdin
    defer f.Close()

    scanner := bufio.NewScanner(f)
    for scanner.Scan() {
        fmt.Println(">", scanner.Text())
    }
}

stdOUT.go

package main

import (
    "io"
    "os"
)

func main() {
    myString := ""
    arguments := os.Args
    if len(arguments) == 1 {
        myString = "Please give me one argument!"
    } else {
        myString = arguments[1]
    }

    io.WriteString(os.Stdout, myString)
    io.WriteString(os.Stdout, "\n")
}