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Full Discussion: Users and groups
Special Forums Cybersecurity Users and groups Post 25137 by Perderabo on Thursday 25th of July 2002 08:28:13 AM
Old 07-25-2002
It depends or your version of Unix. Originally, it was one group at a time and you used the newgrp command to switch groups as needed. BSD introduced the concept of one user being in many groups at once. This is a better way of doing things and it caught on. Most versions of Unix have adopted it. HP-UX actually supports both techniques, depending on how you configure it. If you post your version of unix, we may be able to give you a more definitive answer.
 

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LEARN ABOUT MINIX

group

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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