Observing the clipboard and logging its history by PowerShell. ref: http://qiita.com/saggie/items/481461a436a1d6801bbd

ClipboardObserver.ps1

# set window title
(Get-Host).UI.RawUI.WindowTitle = $MyInvocation.MyCommand

# get text from the clipboard
Add-Type -AssemblyName System.Windows.Forms
$clipText = [Windows.Forms.Clipboard]::GetText()

Write-Host $clipText

while ($true)
{
    # check if there is any updates in the clipboard
    $latestClipText = [Windows.Forms.Clipboard]::GetText()
    if ($latestClipText -ne $clipText)
    {
        # update the cache
        $clipText = $latestClipText

        Write-Host "- - -"
        Write-Host $clipText
    }
    Start-Sleep -Seconds 1
}

ClipboardObserverRunner.bat

set THIS_FILE_PATH=%~dp0
powershell.exe -STA -File "%THIS_FILE_PATH%ClipboardObserver.ps1"