visual-diff-mode

Use color-coding to compare two buffers.

The visual-diff command creates a buffer in visual diff mode that shows the changes between one buffer and another. Added lines are shown with a yellow background, deleted lines are shown with a red background, and common lines are colored as in the original buffers.

In a visual-diff buffer, the keys Alt-<Down> and Alt-] move to the start of the next changed or common section. The keys Alt-<Up> and Alt-[ move to the previous one.

Press "a" or "b" to visit either of the two buffers being compared. Press "c" to visit both in a pair of windows, one below the other, or "s" to visit both in side-by-side windows. If both buffers being compared are associated with files, you can press Shift-A to copy file A to file B, or Shift-B to copy file B to file A. You will be prompted to confirm overwriting an existing file. Overwriting a newer file with an older one will mention that in the prompt.

More info:

Comparing Two Buffers

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