how to list of Groups on Ubuntu server,

To list all the groups, including ones used only by the system. Just type:

cat /etc/group

 

To list all the groups of which the current user is a member.

groups

 

To add a user use

useradd name

 

To add a user to a specific group use

usermod -G name-of-group -a ‘name-of-user

 

For more information on all these – and it’s really a good idea to make sure you know what you’re doing before doing system-level commands — you can type:

info command-name

 

For instance “man useradd”.

man command-name

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