Print the help text when got error input

app/cmd/job.go

@@ -25,12 +25,13 @@ func init() {
 }
 
 var jobCmd = &cobra.Command{
-	Use:   "job",
+	Use:   "job -n",
 	Short: "Print the job of your Jenkins",
 	Long:  `Print the job of your Jenkins`,
 	Run: func(cmd *cobra.Command, args []string) {
 		if jobOption.Name == "" {
-			log.Fatal("need a name")
+			cmd.Help()
+			return
 		}
 
 		jenkins := getCurrentJenkins()

app/cmd/job_build.go

 package cmd
 
 import (
-	"log"
-
 	"github.com/linuxsuren/jenkins-cli/client"
 	"github.com/spf13/cobra"
 )
@@ -12,12 +10,13 @@ func init() {
 }
 
 var jobBuildCmd = &cobra.Command{
-	Use:   "build",
+	Use:   "build -n",
 	Short: "Build the job of your Jenkins",
 	Long:  `Build the job of your Jenkins`,
 	Run: func(cmd *cobra.Command, args []string) {
 		if jobOption.Name == "" {
-			log.Fatal("need a name")
+			cmd.Help()
+			return
 		}
 
 		jenkins := getCurrentJenkins()

app/cmd/job_log.go

@@ -20,12 +20,13 @@ func init() {
 }
 
 var jobLogCmd = &cobra.Command{
-	Use:   "log",
+	Use:   "log -n",
 	Short: "Print the job of your Jenkins",
 	Long:  `Print the job of your Jenkins`,
 	Run: func(cmd *cobra.Command, args []string) {
 		if jobOption.Name == "" {
-			log.Fatal("need a name")
+			cmd.Help()
+			return
 		}
 
 		jenkins := getCurrentJenkins()

app/cmd/job_search.go

@@ -20,12 +20,13 @@ func init() {
 }
 
 var jobSearchCmd = &cobra.Command{
-	Use:   "search",
+	Use:   "search <keyword>",
 	Short: "Print the job of your Jenkins",
 	Long:  `Print the job of your Jenkins`,
 	Run: func(cmd *cobra.Command, args []string) {
 		if len(args) == 0 {
-			log.Fatal("need a keyword")
+			cmd.Help()
+			return
 		}
 
 		keyword := args[0]