echo <line1> > <filename>
echo <line2> >> <filename>

echo Hello, > file.txt
echo.       >>file.txt
echo world  >>file.txt

wordpad file.txt

( echo Hello, & echo. & echo world ) > file.txt

Msgbox "Hello," & vbCrLf & vbCrLf & "world", 0, "Message"

cscript /nologo file.vbs

type source.txt > Destination.Txt

type source.txt >> Destination.Txt

echo foo > test.txt
echo. >> test.txt
echo bar >> test.txt