anchor.diff:  
   set Action=
   if "%~1" == "get"       set Action=get
  +if "%~1" == "update"    set Action=update
   if "%~1" == "help"      set Action=help
   if "%~1" == ""          set Action=help
   
  
positive.code:   call :usage
    goto :exitScript
  )
  
  rem  Read GDAL version #
  for /f %%v in (%GdalAdmin_VersionFile%) do set GdalVersion=%%v
  
negative.code: echo Usage: %Script% [ACTION]
  echo where ACTION is:
  echo   get       -- download and unpack GDAL libraries and C# bindings
  echo   update    -- update the local list of available GDAL packages with the
  echo                current list in the svn repos, then do the "get" action
  echo   help      -- display this message (default)
  
  goto :eof
  