China DOS Union

If the content in 1.txt is the same as that in 2.txt, replace it with blank.

1.txt
c:\windows
c:\windows\12.txt

2.txt
c:\windows
c:\windows\21.txt
c:\windows\123.txt
c:\my doc

The output is 3.txt
c:\windows\123.txt
c:\my doc

[ Last edited by namejm on 2007-2-5 at 10:24 AM ]

There was a similar discussion post before, but I can't find it at once. So I simply post the previously sent complete code for your reference:
@echo off :: Compare the differences in file names between folder A and folder B (there are no sub - directories under both folder A and folder B) :: If there are differences, write the different ones in folder A to a.txt and the different ones in folder B to b.txt, and write the same part of file names to c.txt cd.>a.txt cd.>b.txt cd.>c.txt dir /a-d /b "Path of folder A">list_a.txt dir /a-d /b "Path of folder B">list_b.txt for /f "delims=" %%i in (list_a.txt) do ( find "%%i" list_b.txt>nul 2>nul && echo %%i>>c.txt || echo %%i>>a.txt ) for /f "delims=" %%i in (list_b.txt) do ( find "%%i" list_a.txt>nul 2>nul || echo %%i>>b.txt ) del /q list_a.txt>nul 2>nul del /q list_b.txt>nul 2>nul start a.txt start b.txt start c.txt

Considering that you are a newbie and it's hard for you to understand the complete code in building 2, here is a code customized for you:
@echo off cd.>3.txt for /f "tokens=*" %%i in (2.txt) do ( find "%%i" 1.txt || >>3.txt echo %%i ) start 3.txt

Today I had nothing to do, so I pulled out the code from the third floor to play with. The result surprised me a lot: the content of 3.txt is
c:\windows\21.txt c:\windows\123.txt c:\my doc
instead of what the original poster said
c:\windows\123.txt c:\my doc.

Oh my god, I'm having another setback. Alas, the original posters are really hard to deal with now.

Thanks everyone, but I tried this method and some can't be replaced. For example, the last name is LNK,

for /f "delims==" %%i in (1.txt) do findstr /l /i /x "%%i" "2.txt" ||if %errorlevel% == 0 echo %%i >>3.txt

>>3.txt echo %%i

The one above can also be written in reverse, why?

So far, no one has been able to solve it.

Originally posted by hhh246 at 2006-9-4 13:09:
There is still no one who can solve it yet,

　　Really?

　　Have you tested the above code by yourself? Can you ensure that there are no errors in your statement in the top post?

for /f "delims==" %%i in (1.log) do (
find /i "%%i" "2.log" || echo %%i>>b.txt
)

It works, but it's quite slow. Can anyone write a multi-threaded one?

Originally posted by hhh246 at 2006-9-8 08:52:
for /f "delims==" %%i in (1.log) do (
find /i "%%i" "2.log" || echo %%i>>b.txt
)

It works, but the speed is quite slow. Can anyone write a multithreaded one?

　　Is the speed slow? Unless you are dealing with tens of thousands of lines of text.

　　Multithreaded? Hehe, CMD is in single-task mode, so it's impossible to implement multithreading.

[ Last edited by namejm on 2006-9-8 at 11:26 ]

The code of moderator 3742668 is extremely concise and efficient, PF.