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Operating Systems Linux Ubuntu useradd - shell missing features after adding user Post 302355721 by mark54g on Wednesday 23rd of September 2009 01:39:57 PM
Old 09-23-2009
if you use the -G group that will be a secondary group. If you want them to be in default groups, then you can leave that off. Otherwise, use -G for groups you don't want to include their primary GID. -g is used for their primary GID/group.
 

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GROUP(5)						     Linux Programmer's Manual							  GROUP(5)

NAME
group - user group file DESCRIPTION
The /etc/group file is a text file that defines the groups on the system. There is one entry per line, with the following format: group_name:password:GID:user_list The fields are as follows: group_name the name of the group. password the (encrypted) group password. If this field is empty, no password is needed. GID the numeric group ID. user_list a list of the usernames that are members of this group, separated by commas. FILES
/etc/group BUGS
As the 4.2BSD initgroups(3) man page says: no one seems to keep /etc/group up-to-date. SEE ALSO
chgrp(1), gpasswd(1), groups(1), login(1), newgrp(1), sg(1), getgrent(3), getgrnam(3), gshadow(5), passwd(5) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2016-10-08 GROUP(5)
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