How to see the ubuntu core users

if i create a user(huangda) in ubunutu core system, then use this user to login ubuntu core, but cat /etc/passwd don’t have my user name info.

It’s using extrausers; look in /var/lib/extrausers.

You can probably also use getent passwd, which queries the password database through NSS. That should automatically merge in the extrausers table.

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thanks, now the user gourp name is same with the user name. how to create a user-specified user group?

I’m not sure what you’re wanting to do, exactly, but it looks like you do — what commands would you expect to use to accomplish what you want?