diff --git a/cmd/tasker/main.go b/cmd/tasker/main.go
index ede66ad..e740412 100644
--- a/cmd/tasker/main.go
+++ b/cmd/tasker/main.go
@@ -9,40 +9,46 @@ import (
 	"github.com/adhocore/gronx/pkg/tasker"
 )
 
+var exit = os.Exit
+var tick = time.Minute
+
+var opt tasker.Option
+
+func init() {
+	flag.StringVar(&opt.File, "file", "", "The task file in crontab format (without user)")
+	flag.StringVar(&opt.Tz, "tz", "Local", "The timezone to use for tasks")
+	flag.StringVar(&opt.Shell, "shell", tasker.Shell()[0], "The shell to use for running tasks")
+	flag.StringVar(&opt.Out, "out", "", "The fullpath to file where output from tasks are sent to")
+	flag.BoolVar(&opt.Verbose, "verbose", false, "The verbose mode outputs as much as possible")
+	flag.Int64Var(&opt.Until, "until", 0, "The timeout for task daemon in minutes")
+}
+
 func main() {
-	opt := mustGetOption()
-	taskr := tasker.New(opt)
+	mustParseOption()
 
+	taskr := tasker.New(opt)
 	for _, task := range tasker.MustParseTaskfile(opt) {
 		taskr.Task(task.Expr, taskr.Taskify(task.Cmd, opt))
 	}
 
 	if opt.Until > 0 {
-		taskr.Until(time.Duration(opt.Until) * time.Minute)
+		taskr.Until(time.Duration(opt.Until) * tick)
 	}
 
 	taskr.Run()
 }
 
-func mustGetOption() tasker.Option {
-	var opt tasker.Option
-
-	flag.StringVar(&opt.File, "file", "", "The task file in crontab format")
-	flag.StringVar(&opt.Tz, "tz", "Local", "The timezone to use for tasks")
-	flag.StringVar(&opt.Shell, "shell", tasker.Shell()[0], "The shell to use for running tasks")
-	flag.StringVar(&opt.Out, "out", "", "The fullpath to file where output from tasks are sent to")
-	flag.BoolVar(&opt.Verbose, "verbose", false, "The verbose mode outputs as much as possible")
-	flag.Int64Var(&opt.Until, "until", 0, "The timeout for task daemon in minutes")
+func mustParseOption() {
+	opt = tasker.Option{}
 	flag.Parse()
 
 	if opt.File == "" {
 		flag.Usage()
-		os.Exit(1)
+		exit(1)
 	}
 
 	if _, err := os.Stat(opt.File); err != nil {
-		log.Fatalf("can't read taskfile: %s", opt.File)
+		log.Printf("can't read taskfile: %s", opt.File)
+		exit(1)
 	}
-
-	return opt
 }
diff --git a/cmd/tasker/main_test.go b/cmd/tasker/main_test.go
index 7209d62..b88ff67 100644
--- a/cmd/tasker/main_test.go
+++ b/cmd/tasker/main_test.go
@@ -3,22 +3,45 @@ package main
 import (
 	"os"
 	"testing"
+	"time"
 
 	"github.com/adhocore/gronx/pkg/tasker"
 )
 
 func TestMustGetOption(t *testing.T) {
 	old := os.Args
+	exit = func (code int) {}
 	t.Run("Main", func(t *testing.T) {
 		expect := tasker.Option{File: "../../test/taskfile.txt", Out: "../../test/out.txt"}
-		os.Args = append(os.Args, "-verbose", "-file", expect.File, "-out", expect.Out)
-		opt := mustGetOption()
-		os.Args = old
+		os.Args = append(old, "-verbose", "-file", expect.File, "-out", expect.Out)
+		mustParseOption()
 		if opt.File != expect.File {
 			t.Errorf("file: expected %v, got %v", opt.File, expect.File)
 		}
 		if opt.Out != expect.Out {
 			t.Errorf("out: expected %v, got %v", opt.Out, expect.Out)
 		}
+
+		t.Run("must parse option", func (t *testing.T) {
+			os.Args = append(old, "-verbose", "-out", expect.Out)
+			mustParseOption()
+			if opt.File != "" {
+				t.Error("opt.File must be empty "+opt.File)
+			}
+
+			os.Args = append(old, "-verbose", "-file", "invalid", "-out", expect.Out)
+			mustParseOption()
+			if opt.File != "invalid" {
+				t.Error("opt.File must be invalid")
+			}
+		})
+
+		t.Run("run", func (t *testing.T) {
+			tick = time.Second
+			os.Args = append(old, "-verbose", "-file", expect.File, "-out", expect.Out, "-until", "2")
+			main()
+		})
+
+		os.Args = old
 	})
 }
diff --git a/gronx_test.go b/gronx_test.go
index e3c2ce1..a854c4a 100644
--- a/gronx_test.go
+++ b/gronx_test.go
@@ -137,7 +137,7 @@ func testcases() []Case {
 		{"0 0 * * 0,2-6", "2011-06-20 23:09:00", false, "2011-06-21 00:00"},
 		{"0 0 1 1 0", "2011-06-15 23:09:00", false, "2012-01-01 00:00"},
 		{"0 0 1 JAN 0", "2011-06-15 23:09:00", false, "2012-01-01 00:00"},
-		{"0 0 1 * 0", "2011-06-15 23:09:00", false, "2012-01-01 00:00"}, // 1
+		{"0 0 1 * 0", "2011-06-15 23:09:00", false, "2012-01-01 00:00"},
 		{"0 0 L * *", "2011-07-15 00:00:00", false, "2011-07-31 00:00"},
 		{"0 0 2W * *", "2011-07-01 00:00:00", true, "2011-08-02 00:00"},
 		{"0 0 1W * *", "2011-05-01 00:00:00", false, "2011-05-02 00:00"},
@@ -147,10 +147,10 @@ func testcases() []Case {
 		{"0 0 28W * *", "2011-07-01 00:00:00", false, "2011-07-28 00:00"},
 		{"0 0 30W * *", "2011-07-01 00:00:00", false, "2011-07-29 00:00"},
 		{"0 0 31W * *", "2011-07-01 00:00:00", false, "2011-07-29 00:00"},
-		{"* * * * * 2012", "2011-05-01 00:00:00", false, "err"},
+		{"* * * * * 2012", "2011-05-01 00:00:00", false, "2012-05-01 00:00"}, // 1
 		{"* * * * 5L", "2011-07-01 00:00:00", false, "2011-07-29 00:00"},
 		{"* * * * 6L", "2011-07-01 00:00:00", false, "2011-07-30 00:00"},
-		{"* * * * 7L", "2011-07-01 00:00:00", false, "2011-10-09 00:00"}, // 2
+		{"* * * * 7L", "2011-07-01 00:00:00", false, "2011-10-09 00:00"},
 		{"* * * * 1L", "2011-07-24 00:00:00", false, "2011-07-25 00:00"},
 		{"* * * * TUEL", "2011-07-24 00:00:00", false, "2011-07-26 00:00"},
 		{"* * * 1 5L", "2011-12-25 00:00:00", false, "2012-01-27 00:00"},
@@ -161,8 +161,8 @@ func testcases() []Case {
 		{"5/20 * * * *", "2018-08-13 00:24:00", false, "2018-08-13 00:25"},
 		{"5/20 * * * *", "2018-08-13 00:45:00", true, "2018-08-13 01:05"},
 		{"5-11/4 * * * *", "2018-08-13 00:03:00", false, "2018-08-13 00:05"},
-		{"0 0 L * 0", "2011-06-15 23:09:00", false, "2011-07-31 00:00"},               // 3
-		{"3-59/15 6-12 */15 1 2-5", "2017-01-08 00:00:00", false, "2018-01-30 06:03"}, // 4
+		{"0 0 L * 0", "2011-06-15 23:09:00", false, "2011-07-31 00:00"},
+		{"3-59/15 6-12 */15 1 2-5", "2017-01-08 00:00:00", false, "2018-01-30 06:03"},
 		{"* * * * MON-FRI", "2017-01-08 00:00:00", false, "2017-01-09 00:00"},
 		{"* * * * TUE", "2017-01-08 00:00:00", false, "2017-01-10 00:00"},
 		{"0 1 15 JUL mon,Wed,FRi", "2019-11-14 00:00:00", false, "2020-07-15 01:00"},
diff --git a/next.go b/next.go
index 41ee5f3..54ee366 100644
--- a/next.go
+++ b/next.go
@@ -3,6 +3,7 @@ package gronx
 import (
 	"errors"
 	"fmt"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -61,18 +62,24 @@ func loop(gron Gronx, segments []string, start time.Time, incl bool) (next time.
 	return start, errors.New("tried so hard")
 }
 
+var dashRe = regexp.MustCompile(`/.*$`)
+
 func isPastYear(year string, ref time.Time, incl bool) bool {
+	if year == "*" || year == "?" {
+		return false
+	}
+
 	min := ref.Year()
 	if !incl {
 		min++
 	}
 	for _, offset := range strings.Split(year, ",") {
-		if strings.Contains(offset, "/") && strings.Index(offset, "*/") != 0 && strings.Index(offset, "0/") != 0 {
+		if strings.Index(offset, "*/") == 0 || strings.Index(offset, "0/") == 0 {
 			return false
 		}
-		for _, part := range strings.Split(offset, "-") {
+		for _, part := range strings.Split(dashRe.ReplaceAllString(offset, ""), "-") {
 			val, err := strconv.Atoi(part)
-			if err != nil || val > min {
+			if err != nil || val >= min {
 				return false
 			}
 		}
diff --git a/pkg/tasker/parser_test.go b/pkg/tasker/parser_test.go
index 2a450e1..9c2ca02 100644
--- a/pkg/tasker/parser_test.go
+++ b/pkg/tasker/parser_test.go
@@ -7,8 +7,8 @@ import (
 func TestMustParseTaskfile(t *testing.T) {
 	t.Run("MustParseTaskfile", func(t *testing.T) {
 		tasks := MustParseTaskfile(Option{File: "../../test/taskfile.txt"})
-		if len(tasks) != 6 {
-			t.Errorf("should have 6 tasks, got %d", len(tasks))
+		if len(tasks) != 8 {
+			t.Errorf("should have 8 tasks, got %d", len(tasks))
 		}
 
 		if tasks[0].Expr != "*/1 0/1 * * *" {
diff --git a/test/taskfile.txt b/test/taskfile.txt
index e3244d0..06d271e 100644
--- a/test/taskfile.txt
+++ b/test/taskfile.txt
@@ -8,6 +8,10 @@
 *   *  *  * * echo '[task 5] *   *  *  * *' > test/task5.out
 * * * * * echo '[task 6] it should go to outfile' && invalid-cmd
 
+# failure tasks
+@always xgronx
+@always false
+
 # below are invalid
 @invalid
 * * * * *