creating users

add user and create home folder:

useradd -m student

specify user shell when creating the user:

useradd -m -s /bin/bash student

specify another location for user home folder:

useradd -m -d /opt/student student

specify default group name or group id:

useradd -m -g student

specify userid:

useradd -m -u 1000 student

create user and add this user to different groups:

useradd -m -g student -G video,docker,sound,lp student

assign password to user:

passwd student

manage groups

add group:

groupadd vidalinux

add user to group:

gpasswd -a student vidalinux

add user to more than one group:

usermod -G wheel,video,sound,lp student

to list all groups on our system:

less /etc/group