https://irian.to/blogs/how-to-search-and-replace-string-across-multiple-files-in-vim
Perform substitution with macros and repeat it
While recording a macro, perform substitution on one file, and repeat the macros across all args.
Assuming the same folder structure and args, here is how it is done:
qq // start macro in q register
%s/stringToBeReplaced/replacementString/ge // the e flag tells vim to not throw an error if there is no match
:wnext //important. This is similar to `:next`, but it also writes the current file
q // stop macro
999@q //repeat this macros either 999 times or to remaining files.
That's it!
