userdel

Additional Notes

userdel removes a local user account from the system account database. It can optionally remove the user's home directory and mail spool.

Deleting users should be done carefully because files owned by the deleted UID may remain on disk.

Syntax

userdel [options] username

Parameters

• options: Flags that change how userdel behaves.
• user: User account affected by the command.
• group: Group account affected by the command.
• file: File or directory whose ownership, mode, or access policy is being changed.

Common Options

• -r, --remove: Remove the user's home directory and mail spool.
• -f, --force: Force removal in some cases.

Examples

sudo userdel olduser

Remove the account but keep files.

sudo userdel -r olduser

Remove the account and its home directory.

find / -nouser -ls 2>/dev/null

Find files that no longer have a valid owner.

Practical Notes

• Back up important user data before deletion.
• Check running processes before removing active service users.
• userdel does not necessarily remove every file the user owns.
• Avoid -f unless you understand why normal deletion failed.