SubLin
Software tool to subtract lines of any text file from another.
..."java -jar sublin.jar -s file1.txt file2.txt >new_file1.txt", to create output file "new_file1.txt", or "java -jar sublin.jar -s file1.txt file2.txt >>new_file1.txt", to create or append to output file "new_file1.txt". SubLin is portable, does not need installation and is developed in Java, so needs the Java Virtual Machine (version 6 or higher) that, in the case, is very easy to download and install.