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#encryption (3)

Cheat sheets (3)

diskutil — macOS Disk & APFS Management

Command-line front-end to Disk Utility on macOS — list, partition, format, repair, encrypt, and snapshot APFS containers, plus build and tear down software RAID volumes.
diskutil macos disk apfs sysadmin cli encryption web-researched

gpg — OpenPGP Encryption & Signing

Practical GnuPG cheat sheet — generate keys, sign and verify files, encrypt for a recipient, sign git commits and tags, and manage trust without the bureaucracy.
gpg security crypto signing encryption cli web-researched

Security Fundamentals — Users, Permissions, Capabilities, MAC, Sandboxing

OS-level security primitives every operator should know: users and groups, file permissions, Linux capabilities, SUID/SGID, mandatory access control (SELinux, AppArmor), sandboxing concepts, least privilege, and encryption at rest vs in transit.
security users groups permissions capabilities suid sgid selinux apparmor sandbox encryption mac sysadmin