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(efaq)Replacing text across multiple files

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How do I perform a replace operation across more than one file?
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   The "tags" feature of Emacs includes the command
`tags-query-replace' which performs a query-replace across all the
files mentioned in the `TAGS' file.  Note: Tags Search.


   As of Emacs 19.29, Dired mode (`M-x dired <RET>', or `C-x d')
supports the command `dired-do-query-replace', which allows users to
replace regular expressions in multiple files.