bat adds line at specific line number

Question

I'm taking this approach to add a line SOME TEXT TO BE ADDED to the top of an existing file. Is there a way to specify the exact line number to add the new text. For example, before the last line (and add a line break) or after the 3rd line (and add a line break)

copy original.txt temp.txt
echo.SOME TEXT TO BE ADDED>original.txt
type temp.txt >>original.txt
del temp.txt

Answer 1

Vbscript

strLineNum = WScript.Arguments(0)
strAddText= WScript.Arguments(1)
strFileName = WScript.Arguments(2)
Set objFS = CreateObject( "Scripting.FileSystemObject" )
Set objFile = objFS.OpenTextFile(strFileName)
Do Until objFile.AtEndOfStream
    linenum=objFile.Line
    strLine = objFile.ReadLine
    If linenum = CInt(strLineNum) Then
        WScript.Echo strAddText
    End If
    WScript.Echo strLine
Loop       
objFile.Close

Usage:

C:\test> cscript //nologo myscript.vbs 2 "text to insert" file >temp
C:\test> ren temp file