flashercs

@echo off
cd /d "%~dp0"
set "srcfile=1.txt"
set "dstfile=2.txt"
set "tmpfile1=%temp%\~a.tmp"
set "tmpfile2=%temp%\~b.tmp"
cd .>"%tmpfile1%"
cd .>"%tmpfile2%"
setlocal EnableDelayedExpansion
set tmpflag=0
set line=0
for /f "usebackq delims=" %%A in ("%srcfile%") do (
  set /a line+=1
  set str!line!=%%A
  if !line! equ 3 (
    if !tmpflag! equ 0 (
      >>%tmpfile1% (echo,!str3!&echo,!str1!&echo,!str2!)
      set tmpflag=1
    ) else (
      >>%tmpfile2% (echo,!str2!&echo,!str1!&echo,!str3!)
      set tmpflag=0
    )
    set line=0
  )
)
endlocal
copy /y /b "%tmpfile1%"+"%tmpfile2%" "%dstfile%"
del "%tmpfile1%"
del "%tmpfile2%"
pause
exit /b
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