diff --git a/weed/shell/command.go b/weed/shell/command.go
new file mode 100644
index 000000000..e1a820ff8
--- /dev/null
+++ b/weed/shell/command.go
@@ -0,0 +1,14 @@
+package shell
+
+import "io"
+
+type command interface {
+	Name() string
+	Help() string
+	Do([]string, *CommandEnv, io.Writer) error
+	IsResourceHeavy() bool
+}
+
+var (
+	Commands = []command{}
+)
diff --git a/weed/shell/commands.go b/weed/shell/commands.go
index a29436a3c..582ee560d 100644
--- a/weed/shell/commands.go
+++ b/weed/shell/commands.go
@@ -6,7 +6,6 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/operation"
 	"github.com/seaweedfs/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/seaweedfs/seaweedfs/weed/storage/needle_map"
-	"io"
 	"net/url"
 	"strconv"
 	"strings"
@@ -38,17 +37,6 @@ type CommandEnv struct {
 	locker       *exclusive_locks.ExclusiveLocker
 }
 
-type command interface {
-	Name() string
-	Help() string
-	Do([]string, *CommandEnv, io.Writer) error
-	IsResourceHeavy() bool
-}
-
-var (
-	Commands = []command{}
-)
-
 func NewCommandEnv(options *ShellOptions) *CommandEnv {
 	ce := &CommandEnv{
 		env:          make(map[string]string),