pusofalse

@echo off
split -l 2 yourfile tmp
for %%a in (tmp*) do if not defined a (set a=a&ren "%%a" a.txt) else ren "%%a" b.txt
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split.exe下载：http://bbs.bathome.net/thread-1114-1-1.html

pusofalse

@echo off
for /f "delims=:" %%a in ('findstr /n /v $ yourfile') do set/a l=%%a/2
split -l %l% yourfile tmp
for %%a in (tmp*) do if not defined a (set "a=a"&ren "%%a" a.txt) else ren "%%a" b.txt
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pusofalse

每个代码都有些问题，修改如下：

@echo off
for /f "delims=:" %%a in ('findstr /n .* "yourfile"') do set/a n=%%a/2
for /f "tokens=1* delims=:" %%i in ('findstr /n .* "yourfile"') do (
      if %%i leq %n% (>>a.txt echo.%%j) else (>>b.txt echo.%%j)
)
pause
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把代码中的yourfile替换为你的文件名。