golang, how to execute command which requires input from user

From the os/exec.Command docs:

// Stdin specifies the process's standard input. If Stdin is
// nil, the process reads from the null device (os.DevNull).
Stdin io.Reader

Set the command's Stdin field before executing it.

// To run any system commands. EX: Cloud Foundry CLI commands: `CF login`
cmd := exec.Command("cf", "login")

// Sets standard output to cmd.stdout writer
cmd.Stdout = os.Stdout

// Sets standard input to cmd.stdin reader
cmd.Stdin = os.Stdin

cmd.Run()