Linux Command to list all FTP users in shell including the users created using vsftpd

I have created a few ftp accounts/users on my CentOS server using vsftpd. Now I would like know the username of that accounts using SHELL. I have root password to access the SSH.

I have tried to find in the /etc/password using command

nano /etc/passwd

but there is no any list of created FTP users found.

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