package mainimport (	"os"	"fmt"	"bufio")func main(){	fileName :=os.Args[1]	file,err := os.Open(fileName)	if err != nil{		return	}	defer file.Close()	fd:=bufio.NewReader(file)	count :=0	for {		_,err := fd.ReadString('\n')		if err!= nil{			break		}		count++	}	fmt.Println(count)}