User Management

Groups

groupadd

groupadd -g 2001 groupname

-g = GID

Users

useradd

useradd -u 2001 -s /bin/false -d /bin/null -c "Users Real Name" -g group username
useradd -m username

-u = UID
-s = Shell
-d = Home Directory
-c = Comment (User's Real Name Typically)
-g = Default Group

Modify Users

usermod

Expire Password

chage -d 0

or

passwd -e username