os.Getenv

显示PATH环境变量的值

  1. package main
  3. import (
  4.     "fmt"
  5.     "os"
  6. )
  8. func main() {
  9.     fmt.Println(os.Getenv("PATH"))
  10. }

os.exit

退出

  1. if err != nil {
  2.     fmt.Printf("Program stopping with error %v", err)
  3.     os.Exit(1)
  4. }

os.Args

参数列表

  1. import (
  2.     "fmt"
  3.     "os"
  4.     "strings"
  5. )
  7. func main() {
  8.     var who string
  9.     if len(os.Args) > 1 {
  10.         who = strings.Join(os.Args[1:], " ")
  11.     }
  12.     fmt.Println("Good Morning", who)
  13. }
  15. >go run main.go 222 333
  16. Good Morning 222 333

os.StartProcess

  1. package main
  3. import (
  4.         "fmt"
  5.         "os"
  6. )
  8. func main() {
  9.         env := os.Environ()
  10.         procAttr := &os.ProcAttr{
  11.                 Env: env,
  12.                 Files: []*os.File{
  13.                         os.Stdin,
  14.                         os.Stdout,
  15.                         os.Stderr,
  16.                 },
  17.         }
  18.         _, err := os.StartProcess("/bin/ls", []string{"ls", "-l"}, procAttr)
  19.         if err != nil {
  20.                 fmt.Printf("Error %v starting process!", err)
  21.                 os.Exit(1)
  22.         }
  23.         //fmt.Printf("The process id is %v", pid)
  24. }