Sudo Mastery
Michael W Lucas
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PGP & GPG
OpenPGP is the most widely used email encryption standard in the world. It is based on PGP (Pretty Good Privacy) as originally developed by Phil Zimmermann. The OpenPGP protocol defines standard fo
SSH Mastery
FreeBSD Mastery: ZFS
21st-Century Data Storage ZFS, the fast, flexible, self-healing filesystem, revolutionized data storage. Leveraging ZFS changes everything about managing FreeBSD systems. With FreeBSD Mastery: ZFS,
