diff --git a/cmd/mailfull/command/main.go b/cmd/mailfull/command/main.go
index 041cf7a..66be466 100644
--- a/cmd/mailfull/command/main.go
+++ b/cmd/mailfull/command/main.go
@@ -1,6 +1,9 @@
 package command
 
 import (
+	"bytes"
+	"flag"
+
 	"github.com/mitchellh/cli"
 )
 
@@ -11,3 +14,17 @@ type Meta struct {
 	SubCmdName string
 	Version    string
 }
+
+// noCommitFlag returns true if `pargs` has "-n" flag.
+// `pargs` is overwrites with non-flag arguments.
+func noCommitFlag(pargs *[]string) (bool, error) {
+	nFlag := false
+
+	flagSet := flag.NewFlagSet("", flag.ContinueOnError)
+	flagSet.SetOutput(&bytes.Buffer{})
+	flagSet.BoolVar(&nFlag, "n", nFlag, "")
+	err := flagSet.Parse(*pargs)
+	*pargs = flagSet.Args()
+
+	return nFlag, err
+}