encode/decode file base64

main.go

package main

import( b64 "encoding/base64"
"fmt"
"log"
"flag"
"io/ioutil"
)

func main() {
    decFlag := flag.Bool("dec", false, "decode instead of encode base64")
    fileName := flag.String("f", "" , "input file")
    flag.Parse()
    // Here's the `string` we'll encode/decode.
    data,err := ioutil.ReadFile(*fileName)
    if err != nil{
        log.Fatal(err)
    }

    if(!*decFlag){
        sEnc := b64.StdEncoding.EncodeToString(data)
        fmt.Println(sEnc)
    }else{
        sDec, err := b64.StdEncoding.DecodeString(string(data))
        if err != nil{
            log.Fatal(err)
        }
        fmt.Println(string(sDec))
    }
}