go里面os包的使用案例

package  main

import (
    "fmt"
    "os"
    "strings"
)
func main(){
    envs:=os.Environ();
    for _,env:=range envs {
        cache:= strings.Split(env,"=");
        fmt.Printf("key=%v value=%v\n",cache[0],cache[1]);
    }
}

package  main
import (
    "fmt"
    "os"
)
func main(){
    path:=os.Getenv("GOPATH");
    fmt.Println(path);
}