topic Duplicate uid's in Operating System - HP-UX

Duplicate uid's

S.Rider — Tue, 24 Jan 2006 17:15:46 GMT

I thought pwck checked for duplicate uids, but I guess not. Strange because grpck does check for duplicate group id numbers.
Anyone know of a command that checks for duplicate uids ? I recently found some dups on one of the recently built servers and I want to check the other 90 to see how widespread the issue is.
Actually I think I'll end up writing the script to check each servers password file against what we refer to as the "master password file" on one server. All other servers are supposed to have had uid's and names assigned from this one master but I'm learning this isn't the case.

Just hoping someone out there has a check-for-duplicate-uid script to save me a few steps.

Re: Duplicate uid's

Paul Sperry — Tue, 24 Jan 2006 17:33:30 GMT

Hi Jay

awk -F: '{ print $3 }' /etc/passwd | sort | uniq -d

you extract all UIDs, sort them, and print only duplicates lines. Simple one liner.

Re: Duplicate uid's

A. Clay Stephenson — Tue, 24 Jan 2006 17:34:26 GMT

Here's one that will check for duplicate logins and duplicate uid's, dupacct.sh. If any are found, output is written on stdout. No news is good news.

Re: Duplicate uid's

James R. Ferguson — Tue, 24 Jan 2006 17:39:25 GMT

Hi Jay:

This script will print out the duplicate UIDs (if any):

#!/usr/bin/perl
use strict;
my %user;
my ($name, $uid);

while (($name,undef,$uid) = getpwent) {
$user{$uid}++;
}
foreach $uid (keys %user) {
print $uid, "\n" if $user{$uid} > 1;
}
1;

Regards!

...JRF...

Re: Duplicate uid's

James R. Ferguson — Tue, 24 Jan 2006 18:11:36 GMT

Hi (again) Jay:

Here's a better version. This script finds any duplicate UIDs and reports them along with the associated usernames. Nothing is reported if no duplicates exist.

#!/usr/bin/perl
use strict;
my %user;
my ($name, $uid);

while (($name,undef,$uid) = getpwent) {
push( @{$user{$uid}}, $name );
}
foreach $uid (sort keys %user) {
print "$uid = @{$user{$uid}}\n" if ($#{$user{$uid}}) > 0;
}

...For example:

103 = jay jaykoonz koonz
107 = oper operator

Regards!

...JRF...

Re: Duplicate uid's

Sundar_7 — Mon, 30 Jan 2006 15:58:41 GMT

I must be missing something. Why do you have to write perls and C when you already have the logins command ?

logins -d will list the user accounts with duplicate IDs.

Re: Duplicate uid's

Rick Garland — Mon, 30 Jan 2006 16:06:25 GMT

The logins command has a switch for checking dup UIDs.

Other options available. do 'man logins'

Re: Duplicate uid's

James R. Ferguson — Mon, 30 Jan 2006 16:07:49 GMT

Hi Sundar:

You wrote, "Why do you have to write perls and C when you already have the logins command ?".

I suppose I could answer, "For fun, of course!". While that is true, I had flat forgotten about the 'logins' command :-))

Thanks!

Regards!

..JRF...

Re: Duplicate uid's

Sundar_7 — Mon, 30 Jan 2006 16:38:45 GMT

James,

Being an avid scripter myself, I would agree with you it is "fun". Take no offense but I would rather invest my energy in something that is not readily available

Sundar.

Re: Duplicate uid's

A. Clay Stephenson — Mon, 30 Jan 2006 17:13:25 GMT

Mainly because the logins command is a non-standard command so that if one has to do the check across multiple flavors of UNIX, one would like a one-size-fits-all command.