====== Usermod/useradd ======

 {{tag>"add user to group" "user group" add user "change group"}}

===== usermod example - Add a existing user to existing group =====

Add existing user tony 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 :

 <code># usermod -a -G ftp tony</code>
Change existing user tony primary group to www:
<code> # usermod -g www tony</code>

===== useradd example - Add a new user to secondary group =====
 
Use useradd command to add new users to existing group (or create a new group and then add user). If group does not exist, create it. Syntax:
<code> useradd -G {group-name} username</code>
Create a new user called vivek and add it to group called developers. First login as a root user (make sure group developers exists), enter:
<code> # grep developers /etc/group</code>
Output:
<code>developers:x:1124:</code>
If you do not see any output then you need to add group developers using groupadd command:
 <code># groupadd developers</code>
 Next, add a user called vivek to group developers:
 <code># useradd -G developers vivek</code>
 Setup password for user vivek:
 <code># passwd vivek</code>
 Ensure that user added properly to group developers:
<code> # id vivekOutput: 
uid=1122(vivek) gid=1125(vivek) groups=1125(vivek),1124(developers)</code>

Please note that capital G (-G) option add user to a list of supplementary groups. Each group is separated from the next by a comma, with no intervening whitespace. For example, add user jerry to groups admins, ftp, www, and developers, enter:
 <code># useradd -G admins,ftp,www,developers jerry</code>