base64 without echo

b64.go

package main

import (
	"bufio"
	"encoding/base64"
	"fmt"
	"os"
	"strings"
)

func main() {
	var i string
	if len(os.Args) > 1 {
		i = os.Args[1]
	} else {
		r := bufio.NewReader(os.Stdin)
		i, _ = r.ReadString('\n')
	}
	s := strings.TrimRight(i, "\n")
	o, _ := base64.StdEncoding.DecodeString(s)
	fmt.Printf("\n%s\n", string(o))
}