diff --git a/47-dotnet_Microsoft.VisualBasic.vbproj b/47-dotnet_Microsoft.VisualBasic.vbproj
index c12f5e7b..afb78082 100644
--- a/47-dotnet_Microsoft.VisualBasic.vbproj
+++ b/47-dotnet_Microsoft.VisualBasic.vbproj
@@ -955,6 +955,9 @@
     <Compile Include="ApplicationServices\VBDev\XmlDoc\Extensions\APIExtensions2.vb" />
     <Compile Include="ApplicationServices\VBDev\XmlDoc\Extensions\VBSpecific.vb" />
     <Compile Include="ApplicationServices\VBDev\XmlDoc\Serialization\NamespaceDoc.vb" />
+    <Compile Include="CommandLine\CLI\Stream\Extensions.vb" />
+    <Compile Include="CommandLine\CLI\Stream\StreamReader.vb" />
+    <Compile Include="CommandLine\CLI\Stream\StreamWriter.vb" />
     <Compile Include="CommandLine\InteropService\InCompatible.vb" />
     <Compile Include="CommandLine\Interpreters\View\CommandHelp.vb" />
     <Compile Include="CommandLine\Reflection\RunDll.vb" />
diff --git a/ApplicationServices/Parallel/MMFProtocol/MapStream/MSReader.vb b/ApplicationServices/Parallel/MMFProtocol/MapStream/MSReader.vb
index 8172441a..f08657ba 100644
--- a/ApplicationServices/Parallel/MMFProtocol/MapStream/MSReader.vb
+++ b/ApplicationServices/Parallel/MMFProtocol/MapStream/MSReader.vb
@@ -58,21 +58,21 @@ Imports System.IO.MemoryMappedFiles
 
 Namespace Parallel.MMFProtocol.MapStream
 
-    Public MustInherit Class IMapBase : Implements IDisposable
+    Public MustInherit Class MapStream : Implements IDisposable
 
         Public ReadOnly Property URI As String
 
-        Protected _chunkBuffer As Byte()
-        Protected _mmfileStream As MemoryMappedFile
+        Protected buffer As Byte()
+        Protected file As MemoryMappedFile
 
-        Sub New(uri As String, ChunkSize As Long)
+        Sub New(uri As String, chunkSize As Integer)
             Me._URI = uri
-            Me._chunkBuffer = New Byte(ChunkSize - 1) {}
+            Me.buffer = New Byte(chunkSize - 1) {}
         End Sub
 
         Public Function Read() As MMFStream
-            Call _mmfileStream.CreateViewStream.Read(_chunkBuffer, Scan0, _chunkBuffer.Length)
-            Return New MMFStream(_chunkBuffer)
+            Call file.CreateViewStream.Read(buffer, Scan0, buffer.Length)
+            Return New MMFStream(buffer)
         End Function
 
         Public Overrides Function ToString() As String
@@ -112,7 +112,7 @@ Namespace Parallel.MMFProtocol.MapStream
 #End Region
     End Class
 
-    Public Class MSIOReader : Inherits IMapBase
+    Public Class MSIOReader : Inherits MapStream
         Implements IDisposable
 
         ''' <summary>
@@ -132,7 +132,7 @@ Namespace Parallel.MMFProtocol.MapStream
         ''' <param name="ChunkSize">内存映射文件的数据块的预分配大小</param>
         Sub New(uri As String, callback As DataArrival, ChunkSize As Long)
             Call MyBase.New(uri, ChunkSize)
-            _mmfileStream = MemoryMappedFile.OpenExisting(uri)
+            file = MemoryMappedFile.OpenExisting(uri)
             _dataArrivals = callback
 
             Call Parallel.RunTask(AddressOf __threadElapsed)
@@ -152,7 +152,7 @@ Namespace Parallel.MMFProtocol.MapStream
         ''' <returns></returns>
         Public Function ReadBadge() As Long
             Dim buf As Byte() = New Byte(MMFStream.INT64 - 1) {}
-            Call _mmfileStream.CreateViewStream.Read(buf, Scan0, buf.Length)
+            Call file.CreateViewStream.Read(buf, Scan0, buf.Length)
             Dim n As Long = BitConverter.ToInt64(buf, Scan0)
             Return n
         End Function
diff --git a/ApplicationServices/Parallel/MMFProtocol/MapStream/MSWriter.vb b/ApplicationServices/Parallel/MMFProtocol/MapStream/MSWriter.vb
index 1750d287..6e521772 100644
--- a/ApplicationServices/Parallel/MMFProtocol/MapStream/MSWriter.vb
+++ b/ApplicationServices/Parallel/MMFProtocol/MapStream/MSWriter.vb
@@ -59,12 +59,12 @@ Namespace Parallel.MMFProtocol.MapStream
 #Region "Nested Type Definitions"
 
     ''' <summary>
-    ''' 
+    ''' Memory stream writer
     ''' </summary>
     ''' <remarks>
     ''' mmfServer的主要功能是创建并维护一个内存映射文件
     ''' </remarks>
-    Public Class MSWriter : Inherits IMapBase
+    Public Class MSWriter : Inherits MapStream
 
         ''' <summary>
         ''' 
@@ -75,20 +75,16 @@ Namespace Parallel.MMFProtocol.MapStream
             Call MyBase.New(uri, chunkSize)
 
             Try
-                _mmfileStream =
-                    MemoryMappedFiles.MemoryMappedFile.CreateNew(
-                    uri, chunkSize)
+                file = MemoryMappedFiles.MemoryMappedFile.CreateNew(uri, chunkSize)
             Catch ex As Exception
-                _mmfileStream =
-                    MemoryMappedFiles.MemoryMappedFile.CreateOrOpen(
-                    uri, chunkSize)
+                file = MemoryMappedFiles.MemoryMappedFile.CreateOrOpen(uri, chunkSize)
             Finally
             End Try
         End Sub
 
         Public Sub WriteStream(byteData As Byte())
             If Not byteData.IsNullOrEmpty Then
-                Call _mmfileStream.CreateViewStream.Write(
+                Call file.CreateViewStream.Write(
                     byteData, Scan0, byteData.Length)
             End If
         End Sub
diff --git a/CommandLine/CLI/Stream/Extensions.vb b/CommandLine/CLI/Stream/Extensions.vb
new file mode 100644
index 00000000..47ab8b24
--- /dev/null
+++ b/CommandLine/CLI/Stream/Extensions.vb
@@ -0,0 +1,6 @@
+Namespace CommandLine.Stream
+
+    <HideModuleName> Public Module Extensions
+
+    End Module
+End Namespace
\ No newline at end of file
diff --git a/CommandLine/CLI/Stream/StreamReader.vb b/CommandLine/CLI/Stream/StreamReader.vb
new file mode 100644
index 00000000..37126cb8
--- /dev/null
+++ b/CommandLine/CLI/Stream/StreamReader.vb
@@ -0,0 +1,6 @@
+Namespace CommandLine.Stream
+
+    Public Class StreamReader
+
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/CommandLine/CLI/Stream/StreamWriter.vb b/CommandLine/CLI/Stream/StreamWriter.vb
new file mode 100644
index 00000000..545cdf47
--- /dev/null
+++ b/CommandLine/CLI/Stream/StreamWriter.vb
@@ -0,0 +1,6 @@
+Namespace CommandLine.Stream
+
+    Public Class StreamWriter
+
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/CommandLine/CommandLine.vb b/CommandLine/CommandLine.vb
index b8c63768..cdd1a0db 100644
--- a/CommandLine/CommandLine.vb
+++ b/CommandLine/CommandLine.vb
@@ -64,7 +64,6 @@ Imports Microsoft.VisualBasic.ComponentModel.Collection.Generic
 Imports Microsoft.VisualBasic.ComponentModel.DataSourceModel
 Imports Microsoft.VisualBasic.Language
 Imports Microsoft.VisualBasic.Language.Default
-Imports Microsoft.VisualBasic.Language.UnixBash.FileSystem
 Imports Microsoft.VisualBasic.Linq
 Imports Microsoft.VisualBasic.Scripting
 Imports Microsoft.VisualBasic.Scripting.Expressions
@@ -73,6 +72,11 @@ Imports Microsoft.VisualBasic.Text
 
 Namespace CommandLine
 
+    ' file path: C://path/to/file
+    ' standard input: std_in://
+    ' standard output: std_out://
+    ' memory mapping file: memory://file/uri
+
     ''' <summary>
     ''' A command line object that parse from the user input commandline string.
     ''' (从用户所输入的命令行字符串之中解析出来的命令行对象，标准的命令行格式为：