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Full Discussion: Creating groups and users
Top Forums UNIX for Advanced & Expert Users Creating groups and users Post 302697389 by DGPickett on Thursday 6th of September 2012 05:01:08 PM
Old 09-06-2012
"id <test_id>" will tell you if an id is in service. In the beginning, all IDs were in /etc/passwd in colon-separated text, and all groups were in /etc/group.

Later, to maintain identical values across many systems, NIS and YP (yellow pages) were created to share values across systems in addition to the original files, with presentations like the original files from nispasswd or yppasswd. This was especially necessary with NFS mounts, where the same disk with ID and Group #'s on UFS-like file inodes is on two or more systems. Man Page for yppasswd (all Section 1) - The UNIX and Linux Forums

So, it can be simple, or a little more complex.
 

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LEARN ABOUT SUNOS

groups

groups(1)							   User Commands							 groups(1)

NAME

       groups - print group membership of user

SYNOPSIS

       groups [user...]

DESCRIPTION

       The  command groups prints on standard output the groups to which you or the optionally specified user belong. Each user belongs to a group
       specified in  /etc/passwd and possibly to other groups as specified in  /etc/group. Note that  /etc/passwd specifies the numerical ID (gid)
       of the group. The groups command converts gid to the group name in the output.

EXAMPLES

       The output takes the following form:

	      example% groups tester01 tester02
	      tester01 : staff
	      tester02 : staff
	      example%

FILES

       /etc/passwd

       /etc/group

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       group(4), passwd(4), attributes(5)

SunOS 5.10							    14 Sep 1992 							 groups(1)
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