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#capabilities (3)

Concepts (1)

Filesystems

The OS-layer abstraction that turns a flat block device into named, permissioned, hierarchical files — covering inodes, paths, permissions, journaling, and copy-on-write.
os storage posix permissions capabilities inode mount journaling copy-on-write web-researched

Cheat sheets (2)

permissions — chmod, chown, umask, ACLs

POSIX file permissions on Linux. Covers symbolic and octal chmod, ownership with chown, the meaning of r/w/x for files vs. directories, setuid/setgid/sticky bits, umask, ACLs, capabilities, and immutable attributes.
permissions chmod chown umask acl capabilities sysadmin security 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