How to obtain the number of command lines or the number of system environment changes

First, obtain the command line metric data:

Usage: [email protected]: ~ /Code/go/self $./SUM 1 2 4

package mainimport "fmt"import "os"import "strconv"func main() int{arg_num := len(os.Args)fmt.Printf("the num of input is %d\n",arg_num)fmt.Printf("they are :\n")for i := 0 ; i < arg_num ;i++{fmt.Println(os.Args[i])}sum := 0for i := 1 ; i < arg_num; i++{curr,err := strconv.Atoi(os.Args[i])if(err != nil){fmt.Println("error happened ,exit")return 1}sum += curr}fmt.Printf("sum of Args is %d\n",sum)return 0}

Environment Changes of the fetch system:

package mainimport "fmt"import "os"func main(){environ := os.Environ()for i := range environ {fmt.Println(environ[i])}fmt.Println("------------------------------------------------------------\n")logname := os.Getenv("LOGNAME")fmt.Printf("logname is %s\n",logname)}

How to obtain the number of command lines or the number of system environment changes