Add extra environment variables before running a command

cmd := exec.Command("programToExecute")
additionalEnv := "FOO=bar"
newEnv := append(os.Environ(), additionalEnv)
cmd.Env = newEnv
out, err := cmd.CombinedOutput()
if err != nil {
	log.Fatalf("cmd.Run() failed with %s\n", err)
}
fmt.Printf("%s", out)

Use os/exec with pipes or bash expressions on Linux

rcmd := `iw dev | awk '$1=="Interface"{print $2}'`
cmd := exec.Command("bash", "-c", rcmd)
out, err := cmd.CombinedOutput()
if err != nil {
	log.Println(err.Error())
}
log.Println(string(out))

Use os/exec with batch expressions on Windows

cmd := exec.Command("cmd", "/c", "ffmpeg -i myfile.mp4 myfile.mp3 && del myfile.mp4")
out, err := cmd.CombinedOutput()
if err != nil {
	log.Println(err.Error())
}
log.Println(string(out))

Fix local language issues in Windows CMD with os/exec

cmd := exec.Command("cmd", "/c", "chcp 65001 && netsh WLAN show drivers")
out, err := cmd.CombinedOutput()
if err != nil {
	log.Println(err.Error())
}
log.Println(string(out))

When using this method, remember to remove the first line of output (the chcp response) before further processing.