Technology

A practical cheat sheet covering common regex patterns, Perl-compatible lookarounds, and character classes for everyday text processing in bash and grep.

A practical guide to reading Linux load averages, with a traffic analogy that makes the numbers click. Learn the thresholds that matter, how multi-core systems change the math, and which of the three averages to watch.

A quick bash one-liner that pulls per-user CPU time, connection counts, and active session details from MySQL’s INFORMATION_SCHEMA and processlist tables.

Use Apache mod_rewrite to return a 400 error for a specific URI and optionally block hotlinking from other domains. A quick .htaccess snippet that keeps unwanted traffic off a single page.

A visual walkthrough of the core networking components that make up an Amazon VPC, from subnets and gateways to security groups and route tables. Understanding how these pieces interact is essential for designing secure, well-segmented cloud networks.

A Golden Ticket attack lets an attacker forge Kerberos tickets and impersonate any user in an Active Directory domain. Learn how the attack works and the concrete steps you can take to defend against it.