this should work
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echo path to %0 is %~dp0
jeb
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set /a var=1 & echo hello
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set /a leapyear=! (%year% %% 4 )
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set /a leapyear=((!(%year%%%400))^|!(!(%year%%%100)))^&!(%year%%%4)
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@echo off
setlocal
set srcPath=c:\temp\hund
set prefix=100
echo %prefix%
for %%a in (%srcPath%\*.*) do echo ren %%a %%~dpa%prefix%%%~nxa
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for %%a in (*.wav) DO lame.exe /myoptions %%a %%~na.mp3