Here is a #Linux/#Unix command to search the entire system for files with no group or user:
```
sudo find / -nogroup -o -nouser -print 2>/dev/null
```
See https://www.cyberciti.biz/faq/find-files-that-do-not-have-any-owners-or-do-not-belong-to-any-user-under-linuxunix/ for more info.
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