Ubuntu Linux: Add a User To Group

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How do I add a user to group under Ubuntu Linux operating system using command line options?

You need to use the following commands:


[a] useradd command – Create a new user or update default new user information or add a new user to secondary group.

[b] usermod command – Modifies the system account and make changes to existing user accounts.

First, login as the root user

You must login as the root user. You can switch to the root user by typing ‘su –‘ and entering the root password, when prompted. However, sudo command is recommend under Ubuntu Linux for switching to root user:

su -


sudo -s


sudo useradd ...

Ubuntu Linux: add a new user to secondary group

Use the following syntax:

useradd -G Group-name Username
passwd Username

Create a group called foo and add user tom to a secondary group called foo:
$ sudo groupadd foo
$ sudo useradd -G foo tom

# groupadd foo
# useradd -G foo tom

Verify new settings:

id tom
groups tom

Finally, set the password for tom user, enter:
$ sudo passwd tom
# passwd tom
You can add user tom to multiple groups – foo, bar, and ftp, enter:
# useradd -G foo,bar,ftp tom

Ubuntu Linux: add a new user to primary group

To add a user called tom to a group called www use the following command:

useradd -g www tom
id tom
groups tom

Ubuntu Linux: add a existing user to existing group

To add an existing user jerry to ftp supplementary/secondary group with usermod command using -a option ~ i.e. add the user to the supplemental group(s). Use only with -G option:

usermod -a -G ftp jerry
id jerry

To change existing jerry’s primary group to www, enter:

usermod -g www jerry

For more information and options read the following man pages:
man 8 useradd
man 8 usemod


Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

11 comment

  1. It dos not work for me on debian Jessie. I can add the group but eaven if I added the group to the user the user cant acces to the folder …
    usermod -a -G Group-name Username

    permission on the folder are drwxrwsr-x and the user cant add annithing to this !!! So it fail It as been over 2h I’m playing with this with no succes !!!
    more If I look for which group the user have I get withdifferent result:
    in the Username shell the commande “groups” give me
    and the comande “groupes name1” give me
    Username Group-name

    Anny help will be welcom

  2. I don’t think this works; at least not any more. You have to use:
    “usermod -a -G group username”

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