os包
func Getenv(key string) string
func Environ() []string



package main
 
import (
	"fmt"
	"os"
)
func main(){  
	
	fmt.Println(os.Getenv("HOME"))
	fmt.Println(os.Getenv("USER"))	
	
	values := os.Environ()
	for _, value := range values{
		fmt.Println(value)
	}
	
}


https://gitee.com/dyyx/hellocode/blob/master/7days-golang/demo/envdemo.go