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Way to output differences between two files (preferably using command line)

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I am familiar with tools such as tkDiff and WinMerge and am aware of how to see the difference between two files. What I'm looking to do is to produce a report of elements in one file that are not present in another. For example: File1 contains: apple cool dude flan File2 contains: apple ball cool dude elephant I want to produce a report that contains: ball elephant Or, better yet, a report like this: +ball +elephant -flan Does anybody know of a tool that can do this? Preferably with command line options. The report feature in WinMerge isn't too far off what I'd like but there is no command line option to do this (as far as I know). Thanks in advance. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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This might work for you (GNU diff): diff -u file1 file2 | sed -n '1,2d;/^[-+]/p' +ball -flan +elephant

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