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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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groups(1B)					     SunOS/BSD Compatibility Package Commands						groups(1B)

NAME
groups - display a user's group memberships SYNOPSIS
/usr/ucb/groups [user]... DESCRIPTION
With no arguments, groups displays the groups to which you belong; else it displays the groups to which the user belongs. Each user belongs to a group specified in the password file /etc/passwd and possibly to other groups as specified in the file /etc/group. If you do not own a file but belong to the group which it is owned by then you are granted group access to the file. FILES
/etc/passwd /etc/group ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
getgroups(2), attributes(5) NOTES
This command is obsolete. SunOS 5.11 14 Sep 1992 groups(1B)
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