中国DOS联盟

想判断一下行的内容，不符合的取下一行（倒着）。现在每次取到的都是haha,
代码:

@echo off
for /f "tokens=* delims=" %%b in (no.txt) do (
set no=%%b
)
:a
set /a no-=1
for /f "skip=%no% delims=" %%a in (a.txt) do (
set h=%%a
)
if %h:~0,2% neq 20 goto a
if %h:~0,2% equ 20 goto yes
:yes
echo yes
pause

no.txt内容（是a.txt的行数）

3

a.txt内容

2007-11-15 03-47-22
2007-11-15 08-32-59
haha

Last edited by andred0421 on 2007-11-16 at 09:49 AM ]

@echo off&Setlocal

set /p no=<no.txt

:loop

set /a no-=1

if %no% gtr 0 (call :getline %no%)

if "%string:~0,2%" == "20" (echo %string%) else (goto :loop)

endlocal

pause&exit/b



:getline

set string=

for /f "skip=%1 delims=" %%a in (a.txt) do (

set string=%%a&&goto :eof)

::

@echo off

set /p no=<no.txt

for /f "tokens=1* delims=:" %%a in ('findstr /n .* a.txt') do (

set var%%a=%%b

if %%a equ %no% goto loop

)

:loop

call set num=%%var%no%%%

if "%num:~0,2%"=="20" (echo %num%) else set /a no-=1&goto loop

pause

tac.exe 倒序读取文件