john-users - How to determine # users with a shadow file

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Date: Mon, 10 Mar 2008 10:08:27 -0400
From: "Travis Altman" <travisaltman@...il.com>
To: john-users@...ts.openwall.com
Subject: How to determine # users with a shadow file

I have several questions along the same subject,

First how would I determine the number of users (not pseudo users) on a box
from its shadow file?

How does John determine which lines in the shadow file are uers?

I assume these numbers should match up?