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From: Grzegorz Junka <list1@gjunka.com>
Subject: Verify user password
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Date: Sat, 15 Aug 2020 12:39:06 +0000
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How can I verify if a given password matches the password stored in 
master.passwd database for a user account that is set up with 
/nonexistent and /usr/sbin/nologin (so a user that can't normally login 
to the system but still can have a password stored in the database)?

GrzegorzJ