diff --git a/.gitignore b/.gitignore
index c382ded..c7e91dd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 **/*.sw*
 todo-server-yaml
+cmd/cmd
+cmd/cli
diff --git a/cmd/cli.go b/cmd/cli.go
new file mode 100644
index 0000000..d8743bd
--- /dev/null
+++ b/cmd/cli.go
@@ -0,0 +1,52 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"io"
+	"io/ioutil"
+	"local/pt-todo-server/pttodo"
+	"log"
+	"os"
+
+	"gopkg.in/yaml.v2"
+)
+
+func main() {
+	if err := _main(); err != nil {
+		panic(err)
+	}
+}
+
+func _main() error {
+	filepath := flag.String("f", "-", "path to yaml file")
+	flag.Parse()
+
+	var reader io.Reader
+	if *filepath == "-" {
+		reader = os.Stdin
+	} else {
+		b, err := ioutil.ReadFile(*filepath)
+		if err != nil {
+			return err
+		}
+		reader = bytes.NewReader(b)
+	}
+
+	b, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return err
+	}
+
+	var root pttodo.Root
+	if err := yaml.Unmarshal(b, &root); err != nil {
+		return err
+	}
+
+	b2, err := yaml.Marshal(root)
+	if err != nil {
+		return err
+	}
+	log.Printf("%s", b2)
+	return nil
+}
diff --git a/pttodo/todo.go b/pttodo/todo.go
index f400f88..9eb3f57 100644
--- a/pttodo/todo.go
+++ b/pttodo/todo.go
@@ -2,7 +2,7 @@ package pttodo
 
 type Todo struct {
 	Todo     string
-	Detail   string
-	TS       TS
-	Schedule Schedule
+	Detail   string   `yaml:",omitempty"`
+	TS       TS       `yaml:",omitempty"`
+	Schedule Schedule `yaml:",omitempty"`
 }
diff --git a/sample.yaml b/sample.yaml
index 07abf27..fa04a8b 100644
--- a/sample.yaml
+++ b/sample.yaml
@@ -6,12 +6,12 @@ todo:
     ts: 111
   -
     todo: task that appeared when 'when'
-    loop: "* * * * *" # or ([0-9]*[a-z])+ for durations, or int for scheduled/deferred
+    schedule: "* * * * *" # or ([0-9]*[a-z])+ for durations, or int for scheduled/deferred
     ts: 222
 scheduled:
   -
     todo: task that will appear when 'when'
-    loop: "* * * * *" # or ([0-9]*[a-z])+ for durations, or int for scheduled/deferred
+    schedule: "* * * * *" # or ([0-9]*[a-z])+ for durations, or int for scheduled/deferred
     ts: 333
 done:
   - todo: task that is done