I have two very large files that were run slightly different. Some of the lines of data are the same but some of them are different. I would like to merge all of the data into a new file that includes everything that is the same between the two files and everything that is different. The merge command will not work nor will the cat command. The sdiff command probably would work but it is interactive and these file are way to large for me to deal with interactively and I have several pairs of them that need to be done this way. Any advice on how to do this would be helpful.