# useradd –help
-e wait an expiration date but not say the format.
# man useradd
/-e YYYY-MM-DD
Since the user is a C programmer want the C shell:
# useradd -c myuser -e 2015-12-05 -s /bin/tcsh laura
Add people to group
# usermod –help
-g – is for primarry group
-G – is a new list of secondary should not be use because will OVERWRITE the current groups.
-a should be used because is appending.
# id laura
# usermod -aG account laura
/etc/passwd – every user account have his own account.
/etc/shadow – is for passwords. Password is hash
/etc/group
/etc/login.defs – definitions for creating users.
/etc/default/useradd – this is the default for useradd.
skeleton from home directory.
/etc/skel – is used for copy files into new users directory.
Can add files here which will be used for creating users.
# passwd –help
-d delete, -l lock,, -e expire, -w warning, etc.
# chage -E 2015-07-01 laura
# /etc/shadow – have the details about the account of user.
4. expire password in 40 days. Not the account to expire
# passwd -x 90 lisa