environment variables _ golang

Environment variables are a univerial mechanism for conveying configuration information to Unix programs. Let‘s look at how to set, get, and list environmant variables

package main

import (
    "fmt"
    "os"
    "strings"
)

func main() {

    os.Setenv("FOO", "1")
    fmt.Println("FOO:", os.Getenv("FOO"))
    fmt.Println("BAR:", os.Getenv("BAR"))

    for _, e := range os.Environ() {
        pair := strings.Split(e, "=")
        fmt.Println(pair[0])
    }
}

FOO: 1
BAR: 2
BAR
TERM_PROGRAM
SHELL
TERM
TMPDIR
Apple_PubSub_Socket_Render
TERM_PROGRAM_VERSION
OLDPWD
TERM_SESSION_ID
USER
SSH_AUTH_SOCK
__CF_USER_TEXT_ENCODING
PATH
PWD
XPC_FLAGS
XPC_SERVICE_NAME
SHLVL
HOME
LOGNAME
LC_CTYPE
GOPATH
_
FOO

总结 :

　　1 : ....