User/Group/Password Files

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/etc/passwd

used to store user and system accounts

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/etc/shadow

Used to store user passwords (encrypted)

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/etc/group

Used to store group information, and which users are included in a group.

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/etc/skel

This directory is used to define the default items that will get added to a new users home directory

For example, this could contain a README file that contains rules for using the server.

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/etc/default/useradd

This directory is used to define the default options used when the useradd command is used.

For example, this could specify a location that user directories are created, default group to be added to, and more.

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/etc/sudoers

This file is used to define which users have sudo access/