All flavors of UNIX give us system calls to manipulate and scan the password database and the group database. With these system calls we can add, delete, read user information in predefined structs that make it easy to further manipulate.

This article introduces us to several UNIX password database functions and how to use them! =)

Note that this is a tutorial only. The sample code included is niether secure nor threadsafe That might be a nice article for a future date.

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