@echo off
for /f "tokens=1 delims=:" %%a in ('findstr /n "212" "a.txt"') do (
  more +%%a "a.txt"
)
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@echo off
for /f "tokens=1 delims=:" %%a in ('type "a.txt"^|findstr /n "212"') do (
  more +%%a "a.txt"
)
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@echo off
for /f %%a in ('type a.txt') do (
  if defined flag1 (
    if defined flag2 (>>a.txt echo %%a) else (
      >a.txt echo %%a
      set flag2=1
    )
  )
  if "%%a"=="caae" set flag1=1
)
start a.txt
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@echo off
set /p w=请输入要删除开始的数:
for /f %%i in (b.txt) do (
set /a a+=1
echo %%i>c.txt
findstr "%w%">nul c.txt&&goto f
)
:f
for /f "skip=%a%" %%b in (b.txt) do (
echo %%b>>f.txt
)
del c.txt
pause
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@echo off
for /f "tokens=1 delims=:" %%a in ('type "a.txt"^|findstr /n "212"') do (
  more +%%a "a.txt">"b.txt"
  move /y "b.txt" "a.txt"
)
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