:cdo vs :cfdo

https://stackoverflow.com/a/38004355/28799158 :cdo runs a command once for every QuickFix entry. :cfdo runs a command once for every file with QuickFix entries.

Important:* This means that the following command will run :%s/ multiple times if the file has multiple QuickFix entries.

:cdo %s/searchpatter/replacepattern/ | update