::REM *****************************************************
::REM B a t c h   P r o g r a m m i n g   S a m p l e
::REM from http://www.japan-page.net
::REM (C) 2002 John D. Seaman
::REM Copylefted, and released to the general Internet
::REM community, you may use, modify and release this
::REM at will as long as you retain this header.
::REM *****************************************************


::REM Parse a log file (log.txt) and look for any occurrence of the
::REM  text "logon failure", then react accordingly.

::REM Errorlevel 0 = logon errors occurred
::REM Errorlevel 1 = nothing

::REM Get input from file to find command, use errorlevel
::REM to do the resulting logic for success / failure

  find /i "logon failure"<log.txt
  goto result%ERRORLEVEL%


:result0
::REM ** Logon failure occurred. **
  goto :NEXT

:result1
::REM ** No logon failure occurred. **
  goto :NEXT


:NEXT

  echo do something here