I tested the script

Test1.txt

  Operating System	   » Microsoft Windows 7 Ultimate 64-bit
  Os Version			 » 6.1.7600 Ultimate Edition 
  Build Type			 » Multiprocessor Free
  Serial Number		  » 00426-292-0106894-85791
  Processor Name		 » Intel(R) Core(TM)2 Quad  CPU   Q9300  @ 2.50GHz (x64)
  Video Card Name	    » NVIDIA GeForce 9800 GT
  Sound Device Name	  » C-Media PCI Audio Device
  Network Adapter	    » 802.11n Wireless PCI Express Card LAN Adapter
  Network Adapter	    » Realtek RTL8168C(P)/8111C(P) Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)

Test2.txt

  Computer Name		  » HOME-BETA-2008
  Operating System	   » Microsoft Windows 7 Ultimate 64-bit
  Os Version			 » 6.1.7600 Ultimate Edition 
  Build Type			 » Multiprocessor Free
  Serial Number		  » 00426-292-0106894-85791
  Physical Memory	    » 8.00 GB
  Processor Name		 » Intel(R) Core(TM)2 Quad  CPU   Q9300  @ 2.50GHz (x64)
  Video Card Name	    » NVIDIA GeForce 9800 GT
  Sound Device Name	  » C-Media PCI Audio Device
  Network Adapter	    » 802.11n Wireless PCI Express Card LAN Adapter
  Network Adapter	    » Realtek RTL8168C(P)/8111C(P) Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)
  Computer Type	  	» KQ499AA-A2L m9360f

Differences.txt

  Computer Name		  » HOME-BETA-2008
  Physical Memory	    » 8.00 GB
  Computer Type	  	» KQ499AA-A2L m9360f

So the scripts looks for what missing in Test1, From Test2, reports it in Differences.txt

 Dim Fso :Set Fso = CreateObject("Scripting.FileSystemObject")
 Dim StrTxt1, StrTxt2, StrTxt3, Ts
'-> First Text File
  Set Ts = Fso.OpenTextFile("Test1.txt", 1)
  StrTxt1 = Ts.ReadAll
  Ts.Close
'-> Second Text File
  Set Ts = Fso.OpenTextFile("Test2.txt", 1)
	Do Until Ts.AtEndOfStream
	 StrTxt2 = Ts.ReadLine
	If InStr(StrTxt1, StrTxt2) = 0 Then
		StrTxt3 = StrTxt3 & StrTxt2 & vbCrLf
	End If
	Loop 
   Ts.Close
'-> Third Text File
   Set Ts = Fso.CreateTextFile("Differences.txt")
   Ts.WriteLine StrTxt3
   Ts.Close

yes you are right, in my attachment i have provided 2 files that dont work properly with the script, i think this is because of common "fragment" issues, something like that, however the bat works properly since its a line by line comparison although takes a year.

anyway its not a huge deal.

thanks again.

Edited February 6, 201016 yr by bauxite

The script only looks for what missing from one file, what you want is a script that looks for what missing from both files.

I write up a script that will look for what missing from both files.

1.txt

XYZ
ABC
notreallyuncommon
onlyin1.txtsodontreallymatter1
onlyin1.txtsodontreallymatter2
x
y
astring1
astring2
astring3
D
E
p
o
i
GV
END

2.txt

uncommon
XYZ
uncommonstring2
astring1
astring2
astring3
A
B
uncommonstring3
C
D
E
i
o
p
V
Z
notreallyuncommon
uncommonstring1
END

What missing from both files are stored Differences.txt

ABC
onlyin1.txtsodontreallymatter1
onlyin1.txtsodontreallymatter2
x
y
GV
uncommon
uncommonstring2
A
B
uncommonstring3
C
V
Z
uncommonstring1

Save As Sort2.vbs

 Dim Dic :Set Dic = CreateObject("Scripting.Dictionary")
 Dim Fso :Set Fso = CreateObject("Scripting.FileSystemObject")
 Dim Obj, Ts, Txt1
 Set Ts = Fso.OpenTextFile("1.txt", 1)
   Do Until Ts.AtEndOfStream
	Txt1 = Ts.ReadLine 
	Dic.Add Txt1 ,Txt1
	Loop
	Ts.Close 
	 Set Ts = Fso.OpenTextFile("2.txt", 1)
	 Do Until Ts.AtEndOfStream
	  Txt1 = Ts.ReadLine
	  If Not Dic.Exists(Txt1) Then
	   Dic.Add Txt1 ,Txt1
	  Else
	   Dic.Remove Txt1
	  End If 
	 Loop
   Ts.Close	
   Set Ts = Fso.CreateTextFile("Differences.txt")
   For Each Obj In Dic.Keys
	 Ts.WriteLine Obj
   Next 
   Ts.Close

Awesome.

that is quite brilliant, thank you again

Your welcome, now the only problem might be in the first loop change

   Do Until Ts.AtEndOfStream
	Txt1 = Ts.ReadLine 
	Dic.Add Txt1 ,Txt1
	Loop

Dictionary Objects can not have duplicate objects, so incase 1.txt has say

astring3
astring3

the script would error out because the object exists, this code change prevents that error

   Do Until Ts.AtEndOfStream
	Txt1 = Ts.ReadLine 
	 If Not Dic.Exists(Txt1) Then
	  Dic.Add Txt1 ,Txt1
	 End If 
	Loop