*** Grep results can be edited to reflect changes in the originating file.
Like Occur Edit mode, typing 'e' in the "*grep*" buffer will now make the 'grep' results editable. The edits will be reflected in buffers visiting the originating files. Typing 'C-c C-c' will leave the Grep Edit mode.
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Directory listings can also be editable: https://www.masteringemacs.org/article/wdired-editable-dired...