Golang exec.command with input redirection

Question

I\'m trying to run a fairly simple bash command from my Go code. My program writes out an IPTables config file and I need to issue a command to make IPTables refresh from t

Answer 1

first read this /etc/iptables.conf file content then write it to cmd.StdinPipe() like this:

package main

import (
    "io"
    "io/ioutil"
    "log"
    "os/exec"
)

func main() {
    bytes, err := ioutil.ReadFile("/etc/iptables.conf")
    if err != nil {
        log.Fatal(err)
    }
    cmd := exec.Command("/sbin/iptables-restore")
    stdin, err := cmd.StdinPipe()
    if err != nil {
        log.Fatal(err)
    }
    err = cmd.Start()
    if err != nil {
        log.Fatal(err)
    }
    _, err = io.WriteString(stdin, string(bytes))
    if err != nil {
        log.Fatal(err)
    }
}

Answer 2

cmd := exec.Command("/usr/sbin/iptables-restore", "--binary", iptablesFilePath)
_, err := cmd.CombinedOutput()
if err != nil {
    return err
}
return nil

this work fine on my Raspberry Pi3