@echo off
(for /l %%a in (1,1,3) do (
    echo,
))>>a.txt
>>a.txt echo,bb
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@echo off
for  /f %%i in (1.txt) do echo %%i
for  /l  %%i in (1 1 3) do echo\
echo bb
pause
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@echo off
(  ( for  /f %%i in (1.txt) do echo %%i ) 
for  /l  %%i in (1 1 3) do echo\ 
echo bb  ) >>2.txt
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@echo off&setlocal enabledelayedexpansion
set test1=a.txt
set test2=http://www.bathome.net/
for /f %%i in ('type %test1%^|find /v /c "*."') do set n1=%%i
echo %n1%
:a
cls
set /p n2=请输入行数
echo %n2%|findstr "^[0-9]*$">nul||goto :a
if %n1% gtr %n2% (set n=%n1%) else (set n=%n2%)
(for /l %%i in (1 1 %n%) do (set x=&set /p x=&echo.!x!&if %%i==%n2% echo.%test2%))<%test1%
pause
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gawk "{print}END{print \"\n\nbbb\"}" a.txt >b.txt
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@echo off&setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%a in (findstr /n .* 1.txt) do (
   if %%a==6 (echo bb) else echo %%b
)
pause
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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (1.txt) do (
   if !h! leq 6 set /a n+=1
   if !h! neq 6 (echo %%a) else echo bb
)
pause
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@echo off&setlocal enabledelayedexpansion
for /l %%a in (2 1 6) do (
   set str=
   set /p str=
   echo !str!
)<1.txt
echo bb
more +6 1.txt
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