@echo off
:: 查找偶數(shù)行內(nèi)容
::
set n=0
for /f "delims=" %%i in (test.txt) do set /a n+=1
for /l %%i in (1,2,%n%) do (
findstr /n "." test.txt|findstr /r "^%%i:">>tmp.txt
)
for /f "tokens=1* delims=:" %%i in (tmp.txt) do echo %%j>>end.txt
del tmp.txt
start end.txt

goto :eof

另一種方案
:: 不產(chǎn)生臨時(shí)文件，并且速度要快得多
:: findstr中如果用.*，則在空行的位置會(huì)顯示"ECHO 處于關(guān)閉狀態(tài)。"；
:: 如果用.，則不會(huì)打印空行
:: code by jm CMD@XP 2006-7-29
@echo off
cd.>result.txt
setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%i in ('findstr /n "." test.txt') do (
set num=%%i
call :mod
if !mod! equ 0 echo %%j>>result.txt
)
start result.txt
goto :eof

:mod
set /a mod=%num%%%2
goto :eof

把上一段代碼稍加改造，就可以去掉文本中的空行
@echo off
cd.>tmp.txt
for /f "tokens=1* delims=:" %%i in ('findstr /n "." test.txt') do (echo %%j>>tmp.txt)
cd.>result.txt
:: 當(dāng)文本中的空行是其他未知代碼時(shí)(從網(wǎng)頁(yè)中復(fù)制過來會(huì)出現(xiàn)這種情況)，
:: 會(huì)在空行處顯示"ECHO 處于關(guān)閉狀態(tài)。"，以下代碼是刪除這行內(nèi)容
findstr /v "\<ECHO 處于關(guān)閉狀態(tài)。\>" tmp.txt>>result.txt
del /q tmp.txt