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.
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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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| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |