@echo off
for %%a in (h:\test\*.all) do (
   for /f "useback tokens=1* delims=:" %%b in ('findstr /n .* "%%a"') do (
      set /p=%%c<nul>%%b.tmp
   )
   echo;
)
copy /b *.tmp h:\test\合并.all
del /f /q *.tmp
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@echo off
findstr /n .* h:\test\*.all>tmp
(for /l %%a in (0 1 100) do (
   for /f "tokens=2* delims=:" %%b in ('findsr "^[^:]:%%a:" tmp') do set /p=%%c<nul)>h:\test\合并.all
   echo;
)
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@echo off&setlocal enabledelayedexpansion
for %%a in (h:\test\*.all) do (
   if "!m!" lss "!n!" set m=n
   set n=
   for /f "delims=" %%b in ("%%a") do (
      set /a n+=1
      for %%z in (@!n!) do set @!n!=!%%z!%%b
      )
   )
(for /l %%a in (1 1 %m%) do echo;!@%%a!)>h:\test\合并.all
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