czjt1234

Set fso = CreateObject("Scripting.FileSystemObject")
set file = fso.OpenTextFile("a.txt")

Do Until file.AtEndOfStream
   strLine = file.ReadLine
   If strLine <> "" Then
      ReDim PreServe br(n)
      strIn = strIn & "$" & strLine & " "
      br(n) = strIn
      n = n + 1
   End If
Loop

n = n - 1
cr = Split(strIn)
strIn = ""
ReDim ar(n)
For i = 0 To n
    j = cr(n - i)
    strIn = strIn & j & " "
    ar(i) = strIn
Next

For i = CLng(UBound(ar) / 2) to 0 step -1
   ar1 = Split(strIn, ar(i))
   If UBound(ar1) > 1 Then
      For j = 1 to UBound(ar1) - 1
         WriteToFile Split(ar1(j)), Split(ar(i))
      Next
      Exit For
   End If 
Next

MsgBox "OK"

Sub WriteToFile(ar2, ar3)
   If UBound(ar2) >= 1 Then
      strOut = Mid(ar2(UBound(ar2) - 1), 2)
   Else
      strOut = Mid(ar3(UBound(ar3) - 1), 2)
   End If
   fso.OpenTextFile("b.txt",8,True).WriteLine strOut
End Sub
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czjt1234

用第三方吧，批处理第三方命令行
大型文本必须批处理第三方命令行，gwak什么的，不过我没研究过，不会
你到批处理板块问吧