i want to run a program based on running operating system. can any one help me to find which operating system is running (95/98/NT/2000).

ECHO.%OS% This works under Windows NT/2000/XP

Also the VER command will work also. -Michael

NT systems have the %OS% variable set by default to 'Windows_NT', and non-NT systems don't. So, if you just want to act depending if the OS is NT (Win NT4,2000,XP) or non-NT (Win9x, Dos 6.22), this will do it: if "%OS%"=="Windows_NT" goto NT echo This is non-NT! goto eof :NT echo This is NT! :eof However, if you need the batch file to act in a certain way for each OS, the best would be to check the return of the VER command. Something like this would be required: ver > %TEMP%.\T1.DAT FIND "MS-DOS" < %TEMP%.\T1.DAT > nul if not errorlevel=1 goto dos FIND "Windows 95" < %TEMP%.\T1.DAT > nul if not errorlevel=1 goto win95 FIND "Windows 98" < %TEMP%.\T1.DAT > nul if not errorlevel=1 goto win98 FIND "Windows 2000" < %TEMP%.\T1.DAT > nul if not errorlevel=1 goto win2000 FIND "Windows XP" < %TEMP%.\T1.DAT > nul if not errorlevel=1 goto winXP echo FATAL ERROR: could not detect your Operating System. goto end :: Here goes the part with the labels :dos :: :win98 :win2000 etc :end if exist %TEMP%.\T1.DAT del %TEMP%.\T1.DAT PS: I used a temporary file and all these lower-than characters intead of "VER|FIND..." because it's faster. -- Leonardo Pignataro - Secret_Doom -- secret_doom@hotmail.com www.batch.hpg.com.br