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@echo off
  setlocal
    for /f "tokens=1 delims=:" %%i in ('^
      findstr /l /b /n /c:"exit /b" "%~dpnx0"') do set "n=%%i"
    more +%n% "%~dpnx0">>foo.ps1
    powershell /nologo /noprofile /noexit .\foo.ps1
  endlocal
exit /b
#PowerShell script begin
function Add-Clock {
  $code = {
    $reg = '\d{2}:\d{2}:\d{2}'
    do {
      $now = Get-Date -format 'HH:mm:ss'
      $old = [Console]::Title

      if ($old -match $pattern) {
        $new = $old -replace $pattern, $now
      }
      else {
        $new = "$now $old"
      }

      [Console]::Title = $new
      Start-Sleep -seconds 1
    } while ($true)
  }

  $ps = [PowerShell]::Create()
  [void]$ps.AddScript($code)
  $ps.BeginInvoke()
}

Add-Clock | Out-Null
Remove-Item .\foo.ps1

Diff to Previous Revision

--- revision 1 2013-03-19 15:57:46
+++ revision 2 2013-10-10 16:24:14
@@ -1,19 +1,24 @@
 @echo off
-  more +4 "%~dpnx0" >> clock.ps1 && powershell -nol -noe .\clock.ps1
+  setlocal
+    for /f "tokens=1 delims=:" %%i in ('^
+      findstr /l /b /n /c:"exit /b" "%~dpnx0"') do set "n=%%i"
+    more +%n% "%~dpnx0">>foo.ps1
+    powershell /nologo /noprofile /noexit .\foo.ps1
+  endlocal
 exit /b
-
+#PowerShell script begin
 function Add-Clock {
   $code = {
-    $regex = '\d{2}:\d{2}:\d{2}'
+    $reg = '\d{2}:\d{2}:\d{2}'
     do {
-      $clock = Get-Date -format 'HH:mm:ss'
+      $now = Get-Date -format 'HH:mm:ss'
       $old = [Console]::Title
 
-      if ($old -match $regex) {
-        $new = $old -replace $regex, $clock
+      if ($old -match $pattern) {
+        $new = $old -replace $pattern, $now
       }
       else {
-        $new = "$clock $oltitle"
+        $new = "$now $old"
       }
 
       [Console]::Title = $new
@@ -22,10 +27,9 @@
   }
 
   $ps = [PowerShell]::Create()
-  $null = $ps.AddScript($code)
-  [void]$ps.BeginInvoke()
+  [void]$ps.AddScript($code)
+  $ps.BeginInvoke()
 }
 
-Add-Clock
-#this is optional string
-Remove-Item .\clock.ps1
+Add-Clock | Out-Null
+Remove-Item .\foo.ps1

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