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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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yppasswd(1)						      General Commands Manual						       yppasswd(1)

NAME
yppasswd - change password in Network Information Service (NIS) SYNOPSIS
yppasswd [name] DESCRIPTION
Note If Enhanced Security is enabled on your system, use the passwd command to change your password, even if NIS is in use. The yppasswd command lets you change your password in the Network Information Service (NIS) map, a network data base service. Only you or the superuser can change your NIS password. When you enter the yppasswd command, the program prompts you for the old password and then for the new password. Note that the passwords are not displayed on the screen. Next, the program asks you for the new password again, to verify that you have typed it correctly. If you do not type the passwords cor- rectly, you will receive an error message after you enter the new password. Your new NIS password must meet one of the following requirements: It must be a combination of at least six alphanumeric characters, or It must be a minimum of four characters, with at least one being non-alphanumeric, such as a control sequence. Note The passwd command does not change the NIS password. This command only changes the local password file (/etc/passwd), and not the NIS mas- ter password file. ERRORS
Your new password does not meet the minimum length requirement. You misspelled your new password or its verification. Your new password can not be activated. It must be different from your old password and your login name. FILES
Password file NIS directory SEE ALSO
passwd(1), passwd(4), ypfiles(4), yppasswdd(8) Network Administration yppasswd(1)
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