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man chage — A command to modify password aging policies and account expiration.
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man gpasswd — A command to administer the /etc/group file.
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man groupadd — A command to add groups.
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man grpck — A command to verify the /etc/group file.
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man groupdel — A command to remove groups.
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man groupmod — A command to modify group membership.
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man pwck — A command to verify the /etc/passwd and /etc/shadow files.
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man pwconv — A tool to convert standard passwords to shadow passwords.
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man pwunconv — A tool to convert shadow passwords to standard passwords.
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man useradd — A command to add users.
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man userdel — A command to remove users.
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man usermod — A command to modify users.