[Foreigner]

Код:

@echo off

for /f "tokens=*" %%i in ('dir /b *.txt') do (

    2>nul 1>result.tmp type result.txt
    if not "%%i"=="test.txt" copy result.tmp+"%%~i" result.txt

)

del result.tmp

[zion87]

Код:

@Echo Off

Set new=newfile.txt
Set test=test.txt

For /f "Delims=*" %%i In ('Dir /b "*.txt" ^|Findstr /bev /c:%test%') Do Call :1 "%%i"
Goto:Eof
:1
Set first=%1
Copy %first% %new%
For /f "Delims=*" %%h In ('Dir /b "*.txt" ^|Findstr /bev /c:%test% /c:%first% /c:%new%') Do Call :2 "%%h"
Exit
:2
Copy %new% + %1

[crindlok]

Большое спасибо ребят, сам не смог, а вы помогли!