go语言exec包调用shell命令

工程中需要用到ffmpeg，想直接用exec包调用shell命令。本来以为很简单，结果折腾了一下午，最后查到了解决方案。

假如之前执行报错的语句为：

cmd := exec.Command("echo", "'helloworld!'")
out, err := cmd.Output()

c := "echo hello world"
cmd := exec.Command("sh", "-c", c)
out, err := cmd.Output()

即可！

感谢万能的stack overflow

reference:

https://stackoverflow.com/questions/20437336/how-to-execute-system-command-in-golang-with-unknown-arguments/20438245#20438245?newreg=80e5ccfd4f7f447c9acc931f5509af2b

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