diff --git a/ossutil/CLI.vb b/ossutil/CLI.vb
index 7d579e0..871ab94 100644
--- a/ossutil/CLI.vb
+++ b/ossutil/CLI.vb
@@ -1,45 +1,45 @@
 #Region "Microsoft.VisualBasic::41b2c7a1b7128583a0d4aa5a13d8a609, ossutil\CLI.vb"
 
-    ' Author:
-    ' 
-    '       asuka (amethyst.asuka@gcmodeller.org)
-    '       xie (genetics@smrucc.org)
-    '       xieguigang (xie.guigang@live.com)
-    ' 
-    ' Copyright (c) 2018 GPL3 Licensed
-    ' 
-    ' 
-    ' GNU GENERAL PUBLIC LICENSE (GPL3)
-    ' 
-    ' 
-    ' This program is free software: you can redistribute it and/or modify
-    ' it under the terms of the GNU General Public License as published by
-    ' the Free Software Foundation, either version 3 of the License, or
-    ' (at your option) any later version.
-    ' 
-    ' This program is distributed in the hope that it will be useful,
-    ' but WITHOUT ANY WARRANTY; without even the implied warranty of
-    ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    ' GNU General Public License for more details.
-    ' 
-    ' You should have received a copy of the GNU General Public License
-    ' along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-
-
-    ' /********************************************************************************/
-
-    ' Summaries:
-
-    ' Class CLI
-    ' 
-    '     Constructor: (+1 Overloads) Sub New
-    ' 
-    '     Function: GetBucketStorageDeviceList, ListObjects
-    ' 
-    '     Sub: Copy
-    ' 
-    ' /********************************************************************************/
+' Author:
+' 
+'       asuka (amethyst.asuka@gcmodeller.org)
+'       xie (genetics@smrucc.org)
+'       xieguigang (xie.guigang@live.com)
+' 
+' Copyright (c) 2018 GPL3 Licensed
+' 
+' 
+' GNU GENERAL PUBLIC LICENSE (GPL3)
+' 
+' 
+' This program is free software: you can redistribute it and/or modify
+' it under the terms of the GNU General Public License as published by
+' the Free Software Foundation, either version 3 of the License, or
+' (at your option) any later version.
+' 
+' This program is distributed in the hope that it will be useful,
+' but WITHOUT ANY WARRANTY; without even the implied warranty of
+' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+' GNU General Public License for more details.
+' 
+' You should have received a copy of the GNU General Public License
+' along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+
+' /********************************************************************************/
+
+' Summaries:
+
+' Class CLI
+' 
+'     Constructor: (+1 Overloads) Sub New
+' 
+'     Function: GetBucketStorageDeviceList, ListObjects
+' 
+'     Sub: Copy
+' 
+' /********************************************************************************/
 
 #End Region
 
@@ -76,7 +76,7 @@ Public Class CLI : Inherits InteropService
 
     <MethodImpl(MethodImplOptions.AggressiveInlining)>
     Public Function GetBucketStorageDeviceList() As IEnumerable(Of Bucket)
-        Return RunProgram("ls").ShellExec.ParseBuckets
+        Return RunProgram("ls", stdin:="y").ShellExec.ParseBuckets
     End Function
 
     ''' <summary>
@@ -86,11 +86,16 @@ Public Class CLI : Inherits InteropService
     ''' <returns></returns>
     <MethodImpl(MethodImplOptions.AggressiveInlining)>
     Public Function ListObjects(uri As String) As IEnumerable(Of [Object])
-        Return RunProgram($"ls {uri}").ShellExec.ParseObjects
+        Return RunProgram($"ls {uri}", stdin:="y").ShellExec.ParseObjects
     End Function
 
+    ''' <summary>
+    ''' File copy operation between the OSS and local file system. FileUpload and FileDownload
+    ''' </summary>
+    ''' <param name="from$"></param>
+    ''' <param name="to$"></param>
     Public Sub Copy(from$, to$)
-        Dim stdout$ = RunProgram($"cp {from.CLIToken} {[to].CLIToken}").ShellExec
+        Dim stdout$ = RunProgram($"cp {from.CLIToken} {[to].CLIToken}", stdin:="y").ShellExec
 
         ' FinishWithError: Scanned 1 objects. Error num:  1. OK num: 0, Transfer size: 0.
         ' Error: oss: service returned without a response body (404 Not Found), Bucket=bionovogene-xcms, Object=mz.biodeep.cn/data/upload/rawfiles/225/181/1761/T201710170947282738.mzXML!
diff --git a/ossutil/Extensions.vb b/ossutil/Extensions.vb
index 35a0fe4..2c312ae 100644
--- a/ossutil/Extensions.vb
+++ b/ossutil/Extensions.vb
@@ -41,6 +41,7 @@
 
 Imports System.Runtime.CompilerServices
 Imports Microsoft.VisualBasic.Data.GraphTheory
+Imports ThinkVB.FileSystem.OSS.Model
 
 Public Module Extensions
 
diff --git a/ossutil/FileSystem.vb b/ossutil/FileSystem.vb
index f165c24..b2f243a 100644
--- a/ossutil/FileSystem.vb
+++ b/ossutil/FileSystem.vb
@@ -278,7 +278,7 @@ Public Class FileSystem
     End Function
 
     ''' <summary>
-    ''' 
+    ''' File upload from local filesystem
     ''' </summary>
     ''' <param name="local$"></param>
     ''' <param name="remote$">不要求远程对象必须要存在</param>