yes: "-N" option implemented.

yes/yes.go

@@ -8,10 +8,19 @@ import(
 	"strings"
 	"github.com/jienfak/goblin/input"
 )
+var(
+	nArg int
+)
 
 func yes(s string){
-	for{
-		fmt.Print(s)
+	if nArg<0{
+		for{
+			fmt.Print(s)
+		}
+	} else {
+		for i:=0 ; i<nArg ; i+=1 {
+			fmt.Print(s)
+		}
 	}
 }
 
@@ -27,6 +36,7 @@ func Run(args []string) int {
 	flagSet := flag.NewFlagSet(arg0, flag.ExitOnError)
 	flagSet.BoolVar(&stdinFlag, "s", false, "Read string from stdin.")
 	flagSet.BoolVar(&nFlag, "n", false, "Do not add net line character.")
+	flagSet.IntVar(&nArg, "N", -1, "Repeat input N times. Negative value means infinite cycle.")
 	flagSet.Usage = func() {
 		fmt.Fprintf(os.Stderr, "Usage of %s: %s [options] [string]\n", arg0, arg0)
 		flagSet.PrintDefaults()