diff --git a/cmd/archive.go b/cmd/archive.go
new file mode 100644
index 0000000..1b57fa6
--- /dev/null
+++ b/cmd/archive.go
@@ -0,0 +1,44 @@
+package cmd
+
+import (
+	"fmt"
+	"github.com/iyear/tdl/app/archive"
+	"github.com/spf13/cobra"
+	"time"
+)
+
+func NewBackup() *cobra.Command {
+	var dst string
+
+	cmd := &cobra.Command{
+		Use:   "backup",
+		Short: "Backup your data",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if dst == "" {
+				dst = fmt.Sprintf("tdl-backup-%s.zip", time.Now().Format("2006-01-02-15_04_05"))
+			}
+
+			return archive.Backup(cmd.Context(), dst)
+		},
+	}
+
+	cmd.Flags().StringVarP(&dst, "dst", "d", "", "destination file path. Default: tdl-backup-<time>.zip")
+
+	return cmd
+}
+
+func NewRecover() *cobra.Command {
+	var file string
+
+	cmd := &cobra.Command{
+		Use:   "recover",
+		Short: "Recover your data",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return archive.Recover(cmd.Context(), file)
+		},
+	}
+
+	cmd.Flags().StringVarP(&file, "file", "f", "", "backup file path")
+
+	return cmd
+}
diff --git a/cmd/archive/backup.go b/cmd/archive/backup.go
deleted file mode 100644
index 207d777..0000000
--- a/cmd/archive/backup.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package archive
-
-import (
-	"fmt"
-	"github.com/iyear/tdl/app/archive"
-	"github.com/spf13/cobra"
-	"time"
-)
-
-var dst string
-
-var CmdBackup = &cobra.Command{
-	Use:   "backup",
-	Short: "Backup your data",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		if dst == "" {
-			dst = fmt.Sprintf("tdl-backup-%s.zip", time.Now().Format("2006-01-02-15_04_05"))
-		}
-
-		return archive.Backup(cmd.Context(), dst)
-	},
-}
-
-func init() {
-	CmdBackup.Flags().StringVarP(&dst, "dst", "d", "", "destination file path. Default: tdl-backup-<time>.zip")
-}
diff --git a/cmd/archive/recover.go b/cmd/archive/recover.go
deleted file mode 100644
index 844e92b..0000000
--- a/cmd/archive/recover.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package archive
-
-import (
-	"github.com/iyear/tdl/app/archive"
-	"github.com/spf13/cobra"
-)
-
-var file string
-
-var CmdRecover = &cobra.Command{
-	Use:   "recover",
-	Short: "Recover your data",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		return archive.Recover(cmd.Context(), file)
-	},
-}
-
-func init() {
-	CmdRecover.Flags().StringVarP(&file, "file", "f", "", "backup file path")
-}
diff --git a/cmd/chat.go b/cmd/chat.go
new file mode 100644
index 0000000..31d9610
--- /dev/null
+++ b/cmd/chat.go
@@ -0,0 +1,87 @@
+package cmd
+
+import (
+	"fmt"
+	"github.com/iyear/tdl/app/chat"
+	"github.com/iyear/tdl/pkg/logger"
+	"github.com/iyear/tdl/pkg/utils"
+	"github.com/spf13/cobra"
+	"math"
+	"strings"
+)
+
+func NewChat() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "chat",
+		Short: "A set of chat tools",
+	}
+
+	cmd.AddCommand(NewChatList(), NewChatExport())
+
+	return cmd
+}
+
+func NewChatList() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "ls",
+		Short: "List your chats",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return chat.List(logger.Named(cmd.Context(), "ls"))
+		},
+	}
+
+	return cmd
+}
+
+func NewChatExport() *cobra.Command {
+	var opts chat.ExportOptions
+
+	cmd := &cobra.Command{
+		Use:   "export",
+		Short: "export messages from (protected) chat for download",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			switch opts.Type {
+			case chat.ExportTypeTime, chat.ExportTypeID:
+				// set default value
+				switch len(opts.Input) {
+				case 0:
+					opts.Input = []int{0, math.MaxInt}
+				case 1:
+					opts.Input = append(opts.Input, math.MaxInt)
+				}
+
+				if len(opts.Input) != 2 {
+					return fmt.Errorf("input data should be 2 integers when export type is %s", opts.Type)
+				}
+
+				// sort helper
+				if opts.Input[0] > opts.Input[1] {
+					opts.Input[0], opts.Input[1] = opts.Input[1], opts.Input[0]
+				}
+			case chat.ExportTypeLast:
+				if len(opts.Input) != 1 {
+					return fmt.Errorf("input data should be 1 integer when export type is %s", opts.Type)
+				}
+			default:
+				return fmt.Errorf("unknown export type: %s", opts.Type)
+			}
+
+			// set default filters
+			for _, filter := range chat.Filters {
+				if opts.Filter[filter] == "" {
+					opts.Filter[filter] = ".*"
+				}
+			}
+
+			return chat.Export(logger.Named(cmd.Context(), "export"), &opts)
+		},
+	}
+
+	utils.Cmd.StringEnumFlag(cmd, &opts.Type, "type", "T", chat.ExportTypeTime, []string{chat.ExportTypeTime, chat.ExportTypeID, chat.ExportTypeLast}, "export type. time: timestamp range, id: message id range, last: last N messages")
+	cmd.Flags().StringVarP(&opts.Chat, "chat", "c", "", "chat id or domain")
+	cmd.Flags().IntSliceVarP(&opts.Input, "input", "i", []int{}, "input data, depends on export type")
+	cmd.Flags().StringToStringVarP(&opts.Filter, "filter", "f", map[string]string{}, "only export media files that match the filter (regex). Default to all. Options: "+strings.Join(chat.Filters, ", "))
+	cmd.Flags().StringVarP(&opts.Output, "output", "o", "tdl-export.json", "output JSON file path")
+
+	return cmd
+}
diff --git a/cmd/chat/chat.go b/cmd/chat/chat.go
deleted file mode 100644
index 8a43f5e..0000000
--- a/cmd/chat/chat.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package chat
-
-import (
-	"github.com/spf13/cobra"
-)
-
-var Cmd = &cobra.Command{
-	Use:   "chat",
-	Short: "A set of chat tools",
-}
-
-func init() {
-	Cmd.AddCommand(cmdList, cmdExport)
-}
diff --git a/cmd/chat/export.go b/cmd/chat/export.go
deleted file mode 100644
index b9f1830..0000000
--- a/cmd/chat/export.go
+++ /dev/null
@@ -1,62 +0,0 @@
-package chat
-
-import (
-	"fmt"
-	"github.com/iyear/tdl/app/chat"
-	"github.com/iyear/tdl/pkg/logger"
-	"github.com/iyear/tdl/pkg/utils"
-	"github.com/spf13/cobra"
-	"math"
-	"strings"
-)
-
-var expOpts = &chat.ExportOptions{}
-
-var cmdExport = &cobra.Command{
-	Use:   "export",
-	Short: "export messages from (protected) chat for download",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		switch expOpts.Type {
-		case chat.ExportTypeTime, chat.ExportTypeID:
-			// set default value
-			switch len(expOpts.Input) {
-			case 0:
-				expOpts.Input = []int{0, math.MaxInt}
-			case 1:
-				expOpts.Input = append(expOpts.Input, math.MaxInt)
-			}
-
-			if len(expOpts.Input) != 2 {
-				return fmt.Errorf("input data should be 2 integers when export type is %s", expOpts.Type)
-			}
-
-			// sort helper
-			if expOpts.Input[0] > expOpts.Input[1] {
-				expOpts.Input[0], expOpts.Input[1] = expOpts.Input[1], expOpts.Input[0]
-			}
-		case chat.ExportTypeLast:
-			if len(expOpts.Input) != 1 {
-				return fmt.Errorf("input data should be 1 integer when export type is %s", expOpts.Type)
-			}
-		default:
-			return fmt.Errorf("unknown export type: %s", expOpts.Type)
-		}
-
-		// set default filters
-		for _, filter := range chat.Filters {
-			if expOpts.Filter[filter] == "" {
-				expOpts.Filter[filter] = ".*"
-			}
-		}
-
-		return chat.Export(logger.Named(cmd.Context(), "export"), expOpts)
-	},
-}
-
-func init() {
-	utils.Cmd.StringEnumFlag(cmdExport, &expOpts.Type, "type", "T", chat.ExportTypeTime, []string{chat.ExportTypeTime, chat.ExportTypeID, chat.ExportTypeLast}, "export type. time: timestamp range, id: message id range, last: last N messages")
-	cmdExport.Flags().StringVarP(&expOpts.Chat, "chat", "c", "", "chat id or domain")
-	cmdExport.Flags().IntSliceVarP(&expOpts.Input, "input", "i", []int{}, "input data, depends on export type")
-	cmdExport.Flags().StringToStringVarP(&expOpts.Filter, "filter", "f", map[string]string{}, "only export media files that match the filter (regex). Default to all. Options: "+strings.Join(chat.Filters, ", "))
-	cmdExport.Flags().StringVarP(&expOpts.Output, "output", "o", "tdl-export.json", "output JSON file path")
-}
diff --git a/cmd/chat/ls.go b/cmd/chat/ls.go
deleted file mode 100644
index 90a4887..0000000
--- a/cmd/chat/ls.go
+++ /dev/null
@@ -1,15 +0,0 @@
-package chat
-
-import (
-	"github.com/iyear/tdl/app/chat"
-	"github.com/iyear/tdl/pkg/logger"
-	"github.com/spf13/cobra"
-)
-
-var cmdList = &cobra.Command{
-	Use:   "ls",
-	Short: "List your chats",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		return chat.List(logger.Named(cmd.Context(), "ls"))
-	},
-}
diff --git a/cmd/dl.go b/cmd/dl.go
new file mode 100644
index 0000000..1032f55
--- /dev/null
+++ b/cmd/dl.go
@@ -0,0 +1,67 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"github.com/iyear/tdl/app/dl"
+	"github.com/iyear/tdl/pkg/consts"
+	"github.com/iyear/tdl/pkg/logger"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"strings"
+)
+
+func NewDownload() *cobra.Command {
+	var opts dl.Options
+
+	cmd := &cobra.Command{
+		Use:     "download",
+		Aliases: []string{"dl"},
+		Short:   "Download anything from Telegram (protected) chat",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			// only one of include and exclude can be specified
+			if len(opts.Include) > 0 && len(opts.Exclude) > 0 {
+				return errors.New("only one of `include` and `exclude` can be specified")
+			}
+
+			// only one of continue and restart can be specified
+			if opts.Continue && opts.Restart {
+				return errors.New("only one of `continue` and `restart` can be specified, or none of them")
+			}
+
+			opts.Template = viper.GetString(consts.FlagDlTemplate)
+			return dl.Run(logger.Named(cmd.Context(), "dl"), &opts)
+		},
+	}
+
+	cmd.Flags().StringSliceVarP(&opts.URLs, consts.FlagDlUrl, "u", []string{}, "telegram message links")
+	cmd.Flags().StringSliceVarP(&opts.Files, consts.FlagDlFile, "f", []string{}, "official client exported files")
+
+	// generate default replacer
+	builder := strings.Builder{}
+	chars := []string{`/`, `\`, `:`, `*`, `?`, `<`, `>`, `|`, ` `}
+	for _, c := range chars {
+		builder.WriteString(fmt.Sprintf("`%s` `_` ", c))
+	}
+	t := fmt.Sprintf(`{{ .DialogID }}_{{ .MessageID }}_{{ replace .FileName %s }}`, builder.String())
+	cmd.Flags().String(consts.FlagDlTemplate, t, "download file name template")
+
+	cmd.Flags().StringSliceVarP(&opts.Include, consts.FlagDlInclude, "i", []string{}, "include the specified file extensions, and only judge by file name, not file MIME. Example: -i mp4,mp3")
+	cmd.Flags().StringSliceVarP(&opts.Exclude, consts.FlagDlExclude, "e", []string{}, "exclude the specified file extensions, and only judge by file name, not file MIME. Example: -e png,jpg")
+
+	cmd.Flags().StringVarP(&opts.Dir, consts.FlagDlDir, "d", "downloads", "specify the download directory. If the directory does not exist, it will be created automatically")
+	cmd.Flags().BoolVar(&opts.RewriteExt, consts.FlagDlRewriteExt, false, "rewrite file extension according to file header MIME")
+	// do not match extension, because some files' extension is corrected by --rewrite-ext flag
+	cmd.Flags().BoolVar(&opts.SkipSame, consts.FlagDlSkipSame, false, "skip files with the same name(without extension) and size")
+
+	cmd.Flags().Int64Var(&opts.PoolSize, consts.FlagDlPool, 3, "specify the size of the DC pool")
+	cmd.Flags().BoolVar(&opts.Desc, consts.FlagDlDesc, false, "download files from the newest to the oldest ones (may affect resume download)")
+
+	// resume flags, if both false then ask user
+	cmd.Flags().BoolVar(&opts.Continue, consts.FlagDlContinue, false, "continue the last download directly")
+	cmd.Flags().BoolVar(&opts.Restart, consts.FlagDlRestart, false, "restart the last download directly")
+
+	_ = viper.BindPFlag(consts.FlagDlTemplate, cmd.Flags().Lookup(consts.FlagDlTemplate))
+
+	return cmd
+}
diff --git a/cmd/dl/dl.go b/cmd/dl/dl.go
deleted file mode 100644
index 6d6c317..0000000
--- a/cmd/dl/dl.go
+++ /dev/null
@@ -1,65 +0,0 @@
-package dl
-
-import (
-	"errors"
-	"fmt"
-	"github.com/iyear/tdl/app/dl"
-	"github.com/iyear/tdl/pkg/consts"
-	"github.com/iyear/tdl/pkg/logger"
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
-	"strings"
-)
-
-var opts = &dl.Options{}
-
-var Cmd = &cobra.Command{
-	Use:     "dl",
-	Aliases: []string{"download"},
-	Short:   "Download anything from Telegram (protected) chat",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		// only one of include and exclude can be specified
-		if len(opts.Include) > 0 && len(opts.Exclude) > 0 {
-			return errors.New("only one of `include` and `exclude` can be specified")
-		}
-
-		// only one of continue and restart can be specified
-		if opts.Continue && opts.Restart {
-			return errors.New("only one of `continue` and `restart` can be specified, or none of them")
-		}
-
-		opts.Template = viper.GetString(consts.FlagDlTemplate)
-		return dl.Run(logger.Named(cmd.Context(), "dl"), opts)
-	},
-}
-
-func init() {
-	Cmd.Flags().StringSliceVarP(&opts.URLs, consts.FlagDlUrl, "u", []string{}, "telegram message links")
-	Cmd.Flags().StringSliceVarP(&opts.Files, consts.FlagDlFile, "f", []string{}, "official client exported files")
-
-	// generate default replacer
-	builder := strings.Builder{}
-	chars := []string{`/`, `\`, `:`, `*`, `?`, `<`, `>`, `|`, ` `}
-	for _, c := range chars {
-		builder.WriteString(fmt.Sprintf("`%s` `_` ", c))
-	}
-	t := fmt.Sprintf(`{{ .DialogID }}_{{ .MessageID }}_{{ replace .FileName %s }}`, builder.String())
-	Cmd.Flags().String(consts.FlagDlTemplate, t, "download file name template")
-
-	Cmd.Flags().StringSliceVarP(&opts.Include, consts.FlagDlInclude, "i", []string{}, "include the specified file extensions, and only judge by file name, not file MIME. Example: -i mp4,mp3")
-	Cmd.Flags().StringSliceVarP(&opts.Exclude, consts.FlagDlExclude, "e", []string{}, "exclude the specified file extensions, and only judge by file name, not file MIME. Example: -e png,jpg")
-
-	Cmd.Flags().StringVarP(&opts.Dir, consts.FlagDlDir, "d", "downloads", "specify the download directory. If the directory does not exist, it will be created automatically")
-	Cmd.Flags().BoolVar(&opts.RewriteExt, consts.FlagDlRewriteExt, false, "rewrite file extension according to file header MIME")
-	// do not match extension, because some files' extension is corrected by --rewrite-ext flag
-	Cmd.Flags().BoolVar(&opts.SkipSame, consts.FlagDlSkipSame, false, "skip files with the same name(without extension) and size")
-
-	Cmd.Flags().Int64Var(&opts.PoolSize, consts.FlagDlPool, 3, "specify the size of the DC pool")
-	Cmd.Flags().BoolVar(&opts.Desc, consts.FlagDlDesc, false, "download files from the newest to the oldest ones (may affect resume download)")
-
-	// resume flags, if both false then ask user
-	Cmd.Flags().BoolVar(&opts.Continue, consts.FlagDlContinue, false, "continue the last download directly")
-	Cmd.Flags().BoolVar(&opts.Restart, consts.FlagDlRestart, false, "restart the last download directly")
-
-	_ = viper.BindPFlag(consts.FlagDlTemplate, Cmd.Flags().Lookup(consts.FlagDlTemplate))
-}
diff --git a/cmd/login.go b/cmd/login.go
new file mode 100644
index 0000000..3633790
--- /dev/null
+++ b/cmd/login.go
@@ -0,0 +1,36 @@
+package cmd
+
+import (
+	"github.com/fatih/color"
+	"github.com/iyear/tdl/app/login"
+	"github.com/iyear/tdl/pkg/consts"
+	"github.com/iyear/tdl/pkg/logger"
+	"github.com/spf13/cobra"
+)
+
+func NewLogin() *cobra.Command {
+	var (
+		code bool
+		opts login.Options
+	)
+
+	cmd := &cobra.Command{
+		Use:   "login",
+		Short: "Login to Telegram",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			color.Yellow("WARN: If data exists in the namespace, data will be overwritten")
+
+			if code {
+				return login.Code(logger.Named(cmd.Context(), "login"))
+			}
+
+			return login.Desktop(cmd.Context(), &opts)
+		},
+	}
+
+	cmd.Flags().StringVarP(&opts.Desktop, consts.FlagLoginDesktop, "d", "", "official desktop client path, and automatically find possible paths if empty")
+	cmd.Flags().StringVarP(&opts.Passcode, consts.FlagLoginPasscode, "p", "", "passcode for desktop client, keep empty if no passcode")
+	cmd.Flags().BoolVar(&code, consts.FlagLoginCode, false, "login with code, instead of importing session from desktop client")
+
+	return cmd
+}
diff --git a/cmd/login/login.go b/cmd/login/login.go
deleted file mode 100644
index 2319d5b..0000000
--- a/cmd/login/login.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package login
-
-import (
-	"github.com/fatih/color"
-	"github.com/iyear/tdl/app/login"
-	"github.com/iyear/tdl/pkg/consts"
-	"github.com/iyear/tdl/pkg/logger"
-	"github.com/spf13/cobra"
-)
-
-var (
-	code bool
-	opts login.Options
-)
-
-var Cmd = &cobra.Command{
-	Use:   "login",
-	Short: "Login to Telegram",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		color.Yellow("WARN: If data exists in the namespace, data will be overwritten")
-
-		if code {
-			return login.Code(logger.Named(cmd.Context(), "login"))
-		}
-
-		return login.Desktop(cmd.Context(), &opts)
-	},
-}
-
-func init() {
-	Cmd.Flags().StringVarP(&opts.Desktop, consts.FlagLoginDesktop, "d", "", "official desktop client path, and automatically find possible paths if empty")
-	Cmd.Flags().StringVarP(&opts.Passcode, consts.FlagLoginPasscode, "p", "", "passcode for desktop client, keep empty if no passcode")
-	Cmd.Flags().BoolVar(&code, consts.FlagLoginCode, false, "login with code, instead of importing session from desktop client")
-}
diff --git a/cmd/root.go b/cmd/root.go
index 46469e3..4efdcc3 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -1,14 +1,7 @@
 package cmd
 
 import (
-	"context"
 	"github.com/fatih/color"
-	"github.com/iyear/tdl/cmd/archive"
-	"github.com/iyear/tdl/cmd/chat"
-	"github.com/iyear/tdl/cmd/dl"
-	"github.com/iyear/tdl/cmd/login"
-	"github.com/iyear/tdl/cmd/up"
-	"github.com/iyear/tdl/cmd/version"
 	"github.com/iyear/tdl/pkg/consts"
 	"github.com/iyear/tdl/pkg/logger"
 	"github.com/iyear/tdl/pkg/utils"
@@ -16,39 +9,39 @@ import (
 	"github.com/spf13/cobra/doc"
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
-	"os"
-	"os/signal"
 	"path/filepath"
 )
 
-var cmd = &cobra.Command{
-	Use:               "tdl",
-	Short:             "Telegram Downloader, but more than a downloader",
-	DisableAutoGenTag: true,
-	SilenceErrors:     true,
-	SilenceUsage:      true,
-	PersistentPreRun: func(cmd *cobra.Command, args []string) {
-		// init logger
-		debug, level := viper.GetBool(consts.FlagDebug), zap.InfoLevel
-		if debug {
-			level = zap.DebugLevel
-		}
-		cmd.SetContext(logger.With(cmd.Context(), logger.New(level)))
+func New() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:               "tdl",
+		Short:             "Telegram Downloader, but more than a downloader",
+		DisableAutoGenTag: true,
+		SilenceErrors:     true,
+		SilenceUsage:      true,
+		PersistentPreRun: func(cmd *cobra.Command, args []string) {
+			// init logger
+			debug, level := viper.GetBool(consts.FlagDebug), zap.InfoLevel
+			if debug {
+				level = zap.DebugLevel
+			}
+			cmd.SetContext(logger.With(cmd.Context(), logger.New(level)))
 
-		ns := viper.GetString(consts.FlagNamespace)
-		if ns != "" {
-			color.Cyan("Namespace: %s", ns)
-			logger.From(cmd.Context()).Info("Namespace",
-				zap.String("namespace", ns))
-		}
-	},
-	PersistentPostRunE: func(cmd *cobra.Command, args []string) error {
-		return logger.From(cmd.Context()).Sync()
-	},
-}
+			ns := viper.GetString(consts.FlagNamespace)
+			if ns != "" {
+				color.Cyan("Namespace: %s", ns)
+				logger.From(cmd.Context()).Info("Namespace",
+					zap.String("namespace", ns))
+			}
+		},
+		PersistentPostRunE: func(cmd *cobra.Command, args []string) error {
+			return logger.From(cmd.Context()).Sync()
+		},
+	}
+
+	cmd.AddCommand(NewVersion(), NewLogin(), NewDownload(),
+		NewChat(), NewUpload(), NewBackup(), NewRecover())
 
-func init() {
-	cmd.AddCommand(version.Cmd, login.Cmd, dl.Cmd, chat.Cmd, up.Cmd, archive.CmdBackup, archive.CmdRecover)
 	cmd.PersistentFlags().String(consts.FlagProxy, "", "proxy address, only socks5 is supported, format: protocol://username:password@host:port")
 	cmd.PersistentFlags().StringP(consts.FlagNamespace, "n", "", "namespace for Telegram session")
 	cmd.PersistentFlags().Bool(consts.FlagDebug, false, "enable debug mode")
@@ -66,18 +59,16 @@ func init() {
 	viper.SetEnvPrefix("tdl")
 	viper.AutomaticEnv()
 
+	generateCommandDocs(cmd)
+
+	return cmd
+}
+
+func generateCommandDocs(cmd *cobra.Command) {
 	docs := filepath.Join(consts.DocsPath, "command")
 	if utils.FS.PathExists(docs) {
 		if err := doc.GenMarkdownTree(cmd, docs); err != nil {
 			color.Red("generate cmd docs failed: %v", err)
-			return
 		}
 	}
 }
-
-func Execute() error {
-	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
-	defer cancel()
-
-	return cmd.ExecuteContext(ctx)
-}
diff --git a/cmd/up.go b/cmd/up.go
new file mode 100644
index 0000000..269b1a6
--- /dev/null
+++ b/cmd/up.go
@@ -0,0 +1,27 @@
+package cmd
+
+import (
+	"github.com/iyear/tdl/app/up"
+	"github.com/iyear/tdl/pkg/consts"
+	"github.com/iyear/tdl/pkg/logger"
+	"github.com/spf13/cobra"
+)
+
+func NewUpload() *cobra.Command {
+	var opts up.Options
+
+	cmd := &cobra.Command{
+		Use:     "upload",
+		Aliases: []string{"up"},
+		Short:   "Upload anything to Telegram",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return up.Run(logger.Named(cmd.Context(), "up"), &opts)
+		},
+	}
+
+	cmd.Flags().StringVarP(&opts.Chat, "chat", "c", "", "chat id or domain, and empty means 'Saved Messages'")
+	cmd.Flags().StringSliceVarP(&opts.Paths, consts.FlagUpPath, "p", []string{}, "dirs or files")
+	cmd.Flags().StringSliceVarP(&opts.Excludes, consts.FlagUpExcludes, "e", []string{}, "exclude the specified file extensions")
+
+	return cmd
+}
diff --git a/cmd/up/up.go b/cmd/up/up.go
deleted file mode 100644
index 136e5ab..0000000
--- a/cmd/up/up.go
+++ /dev/null
@@ -1,25 +0,0 @@
-package up
-
-import (
-	"github.com/iyear/tdl/app/up"
-	"github.com/iyear/tdl/pkg/consts"
-	"github.com/iyear/tdl/pkg/logger"
-	"github.com/spf13/cobra"
-)
-
-var opts = &up.Options{}
-
-var Cmd = &cobra.Command{
-	Use:     "up",
-	Aliases: []string{"upload"},
-	Short:   "Upload anything to Telegram",
-	RunE: func(cmd *cobra.Command, args []string) error {
-		return up.Run(logger.Named(cmd.Context(), "up"), opts)
-	},
-}
-
-func init() {
-	Cmd.Flags().StringVarP(&opts.Chat, "chat", "c", "", "chat id or domain, and empty means 'Saved Messages'")
-	Cmd.Flags().StringSliceVarP(&opts.Paths, consts.FlagUpPath, "p", []string{}, "dirs or files")
-	Cmd.Flags().StringSliceVarP(&opts.Excludes, consts.FlagUpExcludes, "e", []string{}, "exclude the specified file extensions")
-}
diff --git a/cmd/version.go b/cmd/version.go
new file mode 100644
index 0000000..3208322
--- /dev/null
+++ b/cmd/version.go
@@ -0,0 +1,36 @@
+package cmd
+
+import (
+	"bytes"
+	_ "embed"
+	"github.com/fatih/color"
+	"github.com/iyear/tdl/pkg/consts"
+	"github.com/spf13/cobra"
+	"runtime"
+	"text/template"
+)
+
+//go:embed version.tmpl
+var version string
+
+func NewVersion() *cobra.Command {
+	return &cobra.Command{
+		Use:   "version",
+		Short: "Check the version info",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			buf := &bytes.Buffer{}
+			if err := template.Must(template.New("version").Parse(version)).Execute(buf, map[string]interface{}{
+				"Version":   consts.Version,
+				"Commit":    consts.Commit,
+				"Date":      consts.CommitDate,
+				"GoVersion": runtime.Version(),
+				"GOOS":      runtime.GOOS,
+				"GOARCH":    runtime.GOARCH,
+			}); err != nil {
+				return err
+			}
+			color.Blue(buf.String())
+			return nil
+		},
+	}
+}
diff --git a/cmd/version/version.tmpl b/cmd/version.tmpl
similarity index 100%
rename from cmd/version/version.tmpl
rename to cmd/version.tmpl
diff --git a/cmd/version/version.go b/cmd/version/version.go
deleted file mode 100644
index 5e880d8..0000000
--- a/cmd/version/version.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package version
-
-import (
-	"bytes"
-	_ "embed"
-	"github.com/fatih/color"
-	"github.com/iyear/tdl/pkg/consts"
-	"github.com/spf13/cobra"
-	"runtime"
-	"text/template"
-)
-
-//go:embed version.tmpl
-var version string
-
-var Cmd = &cobra.Command{
-	Use:   "version",
-	Short: "Check the version info",
-	Run: func(cmd *cobra.Command, args []string) {
-		buf := &bytes.Buffer{}
-		_ = template.Must(template.New("version").Parse(version)).Execute(buf, map[string]interface{}{
-			"Version":   consts.Version,
-			"Commit":    consts.Commit,
-			"Date":      consts.CommitDate,
-			"GoVersion": runtime.Version(),
-			"GOOS":      runtime.GOOS,
-			"GOARCH":    runtime.GOARCH,
-		})
-		color.Blue(buf.String())
-	},
-}
diff --git a/docs/command/tdl.md b/docs/command/tdl.md
index fbcec11..0d37986 100644
--- a/docs/command/tdl.md
+++ b/docs/command/tdl.md
@@ -19,9 +19,9 @@ Telegram Downloader, but more than a downloader
 
 * [tdl backup](tdl_backup.md)	 - Backup your data
 * [tdl chat](tdl_chat.md)	 - A set of chat tools
-* [tdl dl](tdl_dl.md)	 - Download anything from Telegram (protected) chat
+* [tdl download](tdl_download.md)	 - Download anything from Telegram (protected) chat
 * [tdl login](tdl_login.md)	 - Login to Telegram
 * [tdl recover](tdl_recover.md)	 - Recover your data
-* [tdl up](tdl_up.md)	 - Upload anything to Telegram
+* [tdl upload](tdl_upload.md)	 - Upload anything to Telegram
 * [tdl version](tdl_version.md)	 - Check the version info
 
diff --git a/docs/command/tdl_chat_export.md b/docs/command/tdl_chat_export.md
index cccb02a..27027ba 100644
--- a/docs/command/tdl_chat_export.md
+++ b/docs/command/tdl_chat_export.md
@@ -9,11 +9,12 @@ tdl chat export [flags]
 ### Options
 
 ```
-  -c, --chat string     chat id or domain
-  -h, --help            help for export
-  -i, --input ints      input data, depends on export type
-  -o, --output string   output JSON file path (default "tdl-export.json")
-  -T, --type string     export type. time: timestamp range, id: message id range, last: last N messages: {time|id|last} (default "time")
+  -c, --chat string             chat id or domain
+  -f, --filter stringToString   only export media files that match the filter (regex). Default to all. Options: file, content (default [])
+  -h, --help                    help for export
+  -i, --input ints              input data, depends on export type
+  -o, --output string           output JSON file path (default "tdl-export.json")
+  -T, --type string             export type. time: timestamp range, id: message id range, last: last N messages: {time|id|last} (default "time")
 ```
 
 ### Options inherited from parent commands
diff --git a/docs/command/tdl_download.md b/docs/command/tdl_download.md
new file mode 100644
index 0000000..3797146
--- /dev/null
+++ b/docs/command/tdl_download.md
@@ -0,0 +1,42 @@
+## tdl download
+
+Download anything from Telegram (protected) chat
+
+```
+tdl download [flags]
+```
+
+### Options
+
+```
+      --continue          continue the last download directly
+      --desc              download files from the newest to the oldest ones (may affect resume download)
+  -d, --dir string        specify the download directory. If the directory does not exist, it will be created automatically (default "downloads")
+  -e, --exclude strings   exclude the specified file extensions, and only judge by file name, not file MIME. Example: -e png,jpg
+  -f, --file strings      official client exported files
+  -h, --help              help for download
+  -i, --include strings   include the specified file extensions, and only judge by file name, not file MIME. Example: -i mp4,mp3
+      --pool int          specify the size of the DC pool (default 3)
+      --restart           restart the last download directly
+      --rewrite-ext       rewrite file extension according to file header MIME
+      --skip-same         skip files with the same name(without extension) and size
+      --template string   download file name template (default "{{ .DialogID }}_{{ .MessageID }}_{{ replace .FileName `/` `_` `\\` `_` `:` `_` `*` `_` `?` `_` `<` `_` `>` `_` `|` `_` ` ` `_`  }}")
+  -u, --url strings       telegram message links
+```
+
+### Options inherited from parent commands
+
+```
+      --debug          enable debug mode
+  -l, --limit int      max number of concurrent tasks (default 2)
+  -n, --ns string      namespace for Telegram session
+      --ntp string     ntp server host, if not set, use system time
+      --proxy string   proxy address, only socks5 is supported, format: protocol://username:password@host:port
+  -s, --size int       part size for transfer, max is 512*1024 (default 131072)
+  -t, --threads int    max threads for transfer one item (default 4)
+```
+
+### SEE ALSO
+
+* [tdl](tdl.md)	 - Telegram Downloader, but more than a downloader
+
diff --git a/docs/command/tdl_upload.md b/docs/command/tdl_upload.md
new file mode 100644
index 0000000..de27afc
--- /dev/null
+++ b/docs/command/tdl_upload.md
@@ -0,0 +1,33 @@
+## tdl upload
+
+Upload anything to Telegram
+
+```
+tdl upload [flags]
+```
+
+### Options
+
+```
+  -c, --chat string        chat id or domain, and empty means 'Saved Messages'
+  -e, --excludes strings   exclude the specified file extensions
+  -h, --help               help for upload
+  -p, --path strings       dirs or files
+```
+
+### Options inherited from parent commands
+
+```
+      --debug          enable debug mode
+  -l, --limit int      max number of concurrent tasks (default 2)
+  -n, --ns string      namespace for Telegram session
+      --ntp string     ntp server host, if not set, use system time
+      --proxy string   proxy address, only socks5 is supported, format: protocol://username:password@host:port
+  -s, --size int       part size for transfer, max is 512*1024 (default 131072)
+  -t, --threads int    max threads for transfer one item (default 4)
+```
+
+### SEE ALSO
+
+* [tdl](tdl.md)	 - Telegram Downloader, but more than a downloader
+
diff --git a/main.go b/main.go
index c1bb614..fd67235 100644
--- a/main.go
+++ b/main.go
@@ -1,12 +1,18 @@
 package main
 
 import (
+	"context"
 	"github.com/fatih/color"
 	"github.com/iyear/tdl/cmd"
+	"os"
+	"os/signal"
 )
 
 func main() {
-	if err := cmd.Execute(); err != nil {
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+
+	if err := cmd.New().ExecuteContext(ctx); err != nil {
 		color.Red("%v", err)
 	}
 }