@echo on&setlocal enabledelayedexpansion
for /f %%a in ('dir *.jpg /b') do (for /f %%b in ('dir *.pdf /b') do set a=%%a&set a=!a:~0,-5!&ren %%b !a!.pdf
)
pause
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@echo off
setlocal enabledelayedexpansion
dir /b *.jpg >file_jpg.txt
dir /b *.pdf >file_pdf.txt
(for /f "delims=" %%i in (file_jpg.txt) do (
    set /p strPDF=
    ren "!strPDF!" "%%~ni.pdf"
))<file_pdf.txt
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@echo on&setlocal enabledelayedexpansion
for /f %%a in ('dir *.jpg /b') do (for /f %%b in ('dir *.pdf /b') do set a=%%a&set a=!a:~0,10!&ren %%b !a!.pdf
)
pause
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@echo off
(for %%a in (*.jpg) do (
    set "name=%%~na"
    setlocal enabledelayedexpansion
    ren *.pdf "!name:~,10!._pdf"
    endlocal
)) 2>nul
ren *._pdf *.pdf
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@echo off
(for /f "delims=" %%a in (%~s0) do (
   set str=%%a
   setlocal enabledelayedexpansion
   echo !str!
   endlocal
))>test1.txt
pause
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@echo off&setlocal enabledelayedexpansion
(for /f "delims=" %%a in (%~s0) do (
   set str=%%a
   echo !str!
))>test2.txt
pause
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@echo off
setlocal enabledelayedexpansion
for /f "tokens=*" %%i in ('^<%~s0 find /c /v ""') do set /a lineCount=%%i
<%~s0 >test2.txt (for /l %%a in (1 1 !lineCount!) do (
   set /p str=
   echo !str!
))
echo 共 !lineCount! 行
fc test2.txt %~s0
pause
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