You can use find command to find out all files that do not have any owners or do not belong to any user under Linux/UNIX/BSD operating systems.
Find file owned by user id 1050 (useful if you deleted user account):
# find / -uid 1050
Find out all files that are not owned by any user:
# find / -nouser
Find out all files that are not owned by any group:
# find / -nogroup
For example in real life on busy clustered hosting server some time we remove 5-10 users and for security reasons you need to find out all files are not owned by any user or group then you can type command:
# find / -nogroup -nouser
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