If you have two versions of a spreadsheet, text, HTML, or other file that you want to compare line by line, you can use either of two pretty sweet, free programs. They line up the two files side by side, line for line, and highlight the differences. Then they give you some tools for editing and merging and stuff.
• DiffMerge, or
• FileMerge, which is Apple's own Developer utility. You can get all the Developer tools for free from your install DVD, or the latest version of them for free by signing up for the Apple Developer Connection program.
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