(emacs)Comparison in Dired

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File Comparison with Dired

   Here are two Dired commands that compare specified files using

     Compare the current file (the file at point) with another file
     (the file at the mark) using the `diff' program (`dired-diff').
     The file at the mark is the first argument of `diff', and the file
     at point is the second argument.

     Compare the current file with its latest backup file
     (`dired-backup-diff').  If the current file is itself a backup,
     compare it with the file it is a backup of; this way, you can
     compare a file with any backup version of your choice.

     The backup file is the first file given to `diff'.

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