China DOS Union

The content in the question is mainly about how to write a batch processing program to compare the MAC addresses in two text files and handle the situation where the MAC address changes. The following is a possible batch processing code idea (for reference only, may need to be adjusted according to actual situations):

```batch
@echo off
setlocal enabledelayedexpansion
for /f "tokens=1,2 delims=:" %%a in (a.txt) do (
set "ip_a=%%a"
set "mac_a=%%b"
for /f "tokens=1,2 delims=:" %%c in (b.txt) do (
if "%%c"=="!ip_a!" (
if not "%%d"=="!mac_a!" (
echo!ip_a!:!mac_a!>>1.txt
)
goto next
)
)
:next
)
endlocal
```

Please note that this is a simple implementation idea. In actual use, it may need to be further optimized and adjusted according to more complex actual situations.

Other projects, such as: 192.168.2.1, 192.168.2.3, etc. Do you not need to check?

@echo off if exist 1.txt del 1.txt for /f "delims=: tokens=1*" %%a in (a.txt) do ( for /f "delims=" %%_ in ('findstr "%%a" b.txt') do ( if NOT "%%a:%%b"=="%%_" >>1.txt echo %%_ ) ) start 1.txt

[最后编辑于2007-3-10 下午06:10由lxmxn]

Also post a paragraph to play:

@echo off setlocal enabledelayedexpansion for /f "tokens=1,2 delims=:" %%i in (a.txt) do set "%%i=%%j" echo ============================ echo The MAC changes in documents a.txt and b.txt are: echo. for /f "tokens=1,2 delims=:" %%i in (b.txt) do ( if /i not "!%%i!"=="%%j" ( echo %%i %%j if "%%i"=="192.168.2.2" set flag=1 ) ) echo ----------------------------- echo Among them: if defined flag (echo The MAC of 192.168.2.2 has been changed.) else echo The MAC of 192.168.2.2 has not been changed. echo ============================== pause>nul

Originally posted by youxi01 at 2007-3-10 12:28:
Other items, such as: 192.168.2.1, 192.168.2.3, etc., do they not need to be checked?

Need to, otherwise, it would be easy to do, ``What needs to be checked are hundreds of MACs``

Brother lxmxn, it seems like it didn't respond after running.

```
@echo off
for /f "tokens=1* delims=-" %%i in (a.txt) do (
for /f "tokens=1* delims=-" %%a in (b.txt) do (
if "%%i"=="%%a" if not "%%j"=="%%b" >>1.txt echo %%a-%%b
)
)
pause
```

@echo off
rem The order of IP can be scrambled
setlocal ENABLEDELAYEDEXPANSION
set t1=!time!

set /a num=1
for /f "tokens=1,2 delims=:" %%i in (b.txt) do (
set ip!num!=%%i
set mac!num!=%%j
set /a num+=1
)

for /f "tokens=1,2 delims=:" %%i in (a.txt) do (
for /L %%a in (1,1,!num!) do (
if "!ip%%a!"=="%%i" (
if not "!mac%%a!"=="%%j" echo !ip%%a!:!mac%%a! vs %%i:%%j
)
)
)


echo Number of comparison lines:%num%
echo Start time:%t1%
echo End time:!time!

Hehe, there are really many experts. Well, I didn't use it properly just now. Actually, Brother lxmxn's one can be used. Thanks to everyone. The others are also good. Well, ashamed. I need to learn from you all. I tried, and they all work. hehe

The code on the 4th floor is really extremely efficient. I admire it!

Originally posted by test266 at 2007-3-10 10:35:
The code on floor 4 is really efficient, I admire it!

Sweat~ #4 seems to only check whether that one is equal... If you change others, it doesn't care... A failed code... Don't mention efficiency.

◎echo off
echo XXX.XX.XX.X
exit
What about this efficiency? Sweat~

The brother who went upstairs seems to have not understood the code.

if defined flag (echo 192.168.2.2's MAC has been changed.) else echo 192.168.2.2's MAC has not been changed.

What would your code output if 192.168.2.3 changes?

Either do both or don't be redundant. Just echo %%i %j directly.

Have you tried the fc a.txt b.txt command?

Don't argue anymore. Everyone has different ways to solve problems, which is a good thing and can broaden ideas, isn't it?

Let me solve it with one sentence.
findstr /v /g:b.txt a.txt >1.txt

Hehe, back.

The original meaning of my text is to first find out all the changed macs,
and then judge whether the mac of IP 192.168.2.2 has changed.

The original idea is that this might be more in line with the landlord's meaning, maybe I was wrong.