Golang : How to pipe input data to executing child process?

Problem :

Your program is executing a child process via os/exec and you want to pipe input data to the executing process.

Solution :

Use the StdinPipe() method and issue a .Write([]byte(your data)) to input data to the executing child process.

For example :

 package main

 import (

 func main() {
  cmd := exec.Command("cat")

  stdin, err := cmd.StdinPipe()

  stdin.Write([]byte("Hello World!")) // <------ here

  if err != nil {

  data, err := cmd.Output()

  if err != nil {

  for k, v := range data {
 fmt.Printf("key :  %v, value :  %v \n", k, string(v))

  See also : Golang : Pipe output from one os.Exec(shell command) to another command

By Adam Ng

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