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In Emacs, how do I inspect what has been modified in a buffer (before saving and overwriting the file)?

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http://unix.stackexchange.com – In Emacs, how do I inspect what has been modified in a buffer (before saving and overwriting the file)? (In a sense, the requested action is an analog of git status and git add -i showing what has been modified, only the comparison should be done between the buffer contents (in Emacs's memory) and the file on disk.) Sometime, I forget what has been modified in a buffer, and would like to call a command to remind me. (HowTos)