Chapter 8 Section 1: Managing Users and groups

Explain the passwd file (explain the format aswell)
Explain the shadow file (explain the format aswell)
Explain difference between the two
Explain the group file (and format)
Explain the gshadow file (and format)
Example of pwck command + grpck command
Example of using vipw and vigr instead of regular vi to prevent password corruption

Creating/Removing/Chaning user accounts

Useradd/mod/del/change/passwd examples for modifying users
Useradd: -b (--base-dir, base dir for all home directories), -m (--create-home option), groups etc
the chage command (with examples): -d --lastday, --expiredate --inactive
chage -l chartwell option (display defaults)
login.defs files + /etc/default/useradd
changing defaults through useradd -D ...