(@for /f "delims=" %%a in (a.txt) do @for /f "delims=" %%b in (b.txt) do @for /f "delims=" %%c in (c.txt) do @for /f "delims=" %%d in (d.txt) do @for /f "delims=" %%e in (e.txt) do @for /f "delims=" %%g in (g.txt) do @for /f "delims=" %%h in (h.txt) do @for /f "delims=" %%i in (i.txt) do @echo %%a%%b%%c%%d%%e%%f%%g%%h%%i)>!1.txt