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C:\test>type randomname.bat @echo off cd c:\test\ dir /b ab*.txt > testdata.txt type testdata.txt for /f %%i in ( testdata.txt) do ( echo copy %%i %%i%random%.txt echo ren %%i %%i%random%.txt ) C:\test> randomname.bat abc.txt abc2.txt copy abc.txt abc.txt15611.txt ren abc.txt abc.txt23205.txt copy ...