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This is for users and groups that are defined by /etc/passwd and /etc/group et al as opposed to LDAP-based users.
Group creation
TODO: TBC
Each user's primary group must exist before the user is created unless --user-group is specified on the useradd command.
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TODO: check if they have been locked out by speciall stingspecial string(s) in /etc/passwd or shadow (needs research)