使用环境变量转到exec.Command（）

Question

I would like to run following code in Go:

out, err := exec.Command("echo", "$PATH").Output()

The result was:

$PATH

Instead of the expected value of "PATH=/bin...".

Why? And how can I get the expected value?

Answer 1

From Go by Example: Environment Variables, you can try (instead of a system command echo) to use os.Getenv:

fmt.Println("PATH:", os.Getenv("PATH"))