中国DOS联盟

请高手指导如何编写P处理来删除文本的最后3行,而且文本中包含特殊字符,希望用系统自带的命令!谢谢!

Last edited by hbby on 2007-9-15 at 03:03 PM ]

@echo off

rem delete the last 3 row in a file!

setlocal enabledelayedexpansion

echo _MyFun_>>da.txt

for /f "delims= tokens=1,2*" %%a in  ('@find /n /v "" da.txt') do set n=%%a

echo 文件的原始行数为:%n%

pause

echo 将执行删除最后三行的操作!

pause

set /a l=n-3

echo %l%

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

  set /a m+=1

  if !m! leq !l! echo %%a>>new_a.txt

)

endlocal

pause

自己体会吧!

感谢楼上的朋友,但是文件中含有空行的话就删除不到最后几行了,能再看看吗?谢谢

试一下
@echo off
cd.>test2.txt
for /f "delims=:" %%i in ('findstr /n . test.txt') do set n=%%i
set /a nm=%n% -2>nul
for /f "delims=" %%i in ('findstr /n .* test.txt') do (
set /a mn=%%i 2>nul
set "m=%%i"
setlocal enabledelayedexpansion
set "m=!m:*:=!"
if !nm! EQU !mn! goto end
echo.!m!>>test2.txt
endlocal
)
:end
pause

Last edited by terse on 2007-9-15 at 02:46 PM ]

Originally posted by hbby at 2007-9-15 11:59:
感谢楼上的朋友,但是文件中含有空行的话就删除不到最后几行了,能再看看吗?谢谢

是的
那个写得不完善

你用楼上的吧!(4楼)
那个快1

都是高手,谢谢,这个可以了!

sed -e :a -e "$d;N;2,3ba" -e "P;D" 1.txt>>2.txt