China DOS Union

There is a text:

Wang A male 340505
Wang B male 340503
Wang A male 340505
Wang B male 340503
Wang B male 340503
Wang C female 340502
Wang A male 340505

Want to eliminate duplicate rows, get

Wang A male 340505
Wang B male 340503
Wang C female 340502

???????

```
@echo off
for /f "delims=" %%i in (a.txt) do (
findstr /c:"%%i" b.txt 2>nul||echo %%i>>b.txt
)
pause
```

[ Last edited by jmz573515 on 2008-1-14 at 09:49 AM ]

### bat
@echo %bg% off&SetLocal EnableDelayedExpansion for /f "delims=" %%a in (a.txt) do ( if not "!%%a!"=="batch" ( echo\ set %%a=batch ) ) endlocal pause

### awk
gawk "!a++" a.txt

排序
sort -u a.txt

Originally posted by HAT at 2008-1-14 08:53 PM:
sort
sort -u a.txt

What you said is not for Windows, I see that the sort in Windows XP seems to not have the -u parameter.

Originally posted by honghunter at 2008-1-14 09:12 PM:

What you mentioned is not under Windows, I see that the sort in Windows XP does not have the -u parameter.

Yes
Upon seeing the moderator mention awk, I thought of sort呵呵

Learning

Learning

Learned another trick, every time I come here I gain something, heh heh

What are the meanings of the moderator's echo %bg% off and echo\[%%a]? May I ask if they can be explained? Also, it can be displayed normally without removing %bg% and \[]

set %%a=batch
I didn't understand this sentence.
==================
Oh, I didn't get it for a moment, but I figured it out and bumped an old post.

[ Last edited by NaturalJ0 on 2008-2-19 at 06:48 PM ]

uniq.exe 1.txt>2.txt

It seems that "!%%a!" might be a specific custom-defined placeholder or an identifier with no universal standard meaning in a general sense. Without more context from the specific context of the China DOS Union forum where this appears, it's difficult to give an extremely precise interpretation. It could be something related to a particular script, macro, or local convention within that forum's discussions.

Strictly speaking, it would be better if the second floor added the /X parameter