@echo off
for /f "tokens=1*" %%i in (a.txt) do ren "%%i" "%%j%%~xi"
pause
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@echo off
for /r "d:\abc" %%a in (*.pdf) do (
   for /f "tokens=1,2 delims= " %%b in (a.txt) do ( 
   if "%%~nxa"=="%%b" ren "%%a" "%%c.pdf"
   )
)
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@echo off
setlocal enabledelayedexpansion
for /f %%a in ('dir /s /b *.jpg') do (
	for /f "tokens=1,2" %%i in (names.txt) do (
		if %%~nxa == %%i ren %%a %%~na_%%j.jpg 
		)
	)
pause
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@echo off
for /f "tokens=1*" %%i in (Names.txt) do ren "%%i" "%%~ni_%%j%%~xi"
pause
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