add user from sudo group code example

Example 1: linux add user to group

# Change the primary group a user is assigned to, note the -g here.
# When you use a lowercase g, you assign a primary group. When you 
# use an uppercase -G you assign a new secondary group.
usermod -g groupname username

Example 2: linux add user to group

# add user to additional group

usermod -G groupname username

Example 3: add user to sudoers

echo "username  ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/username

Example 4: show users in sudo group

grep -Po '^sudo.+:\K.*$' /etc/group