*** 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.

Directory listings can also be editable: https://www.masteringemacs.org/article/wdired-editable-dired...