簡單的命令執行

Created: November-22, 2018

// Execute a command a capture standard out. exec.Command creates the command
// and then the chained Output method gets standard out. Use CombinedOutput() 
// if you want both standard out and standerr output
out, err := exec.Command("echo", "foo").Output()
if err != nil {
    log.Fatal(err)
}