.bat file to compare two text files and output the difference
The Simplest and fastest method is using findstr command it will compare and return the result to new file here the script
findstr /vixg:Z:\misc\test1.txt Z:\misc\misc\test2.txt > Z:\misc\misc\test3.txtfindstr /vixg:<source file> <target file> > outputfilehere
/v : Prints only lines that do not contain a match./i : Specifies that the search is not to be case-sensitive./x : Prints lines that match exactly./g: file : Gets search strings from the specified file.
You might want to check this out:
http://gnuwin32.sourceforge.net/packages.html
There are ports of *nix utilities, including one for diff so you won't have to reinvent the wheel.