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ubuntu add user to group

sudo usermod -a -G group username

add user to group

usermod -a -G examplegroup exampleusername

how to add new group to user linux

usermod -a -G groupname username

add user to group linux

sudo usermod -aG <groups> <username>

ubuntu add user to group

sudo usermod -aG groupName userName

# restart or just run
newgrp groupName

command to add a user to a group

sudo usermod -a -G GROUP USER

linux add user to group

sudo groupadd $GROUP 
sudo usermod -aG $GROUP $USER

create new users and add them in group in linux

useradd -mg [groups] [username]

bash add user to group

sudo dseditgroup -o edit -t user -a <user> <group>  # OSX 

linux user groups

 groups $username

linux change user and group

chown USER:GROUP FILE

add user to group

usermod -a -G <group> <user>
$ usermod -a -G developer tom

What is user and group in linux?

User: the owner of the file (person who created the file).
Group:the group can contain multiple users. Therefore, all users in that group will have the same permissions. It makes things easier than assign permission for every user you want.