Linux
Bulletproof SSH: Multi-Identity Git, Socket Persistence, and Zero-Trust Key Management
Most developers cargo-cult their SSH config from Stack Overflow. This is the setup I actually run: three GitHub identities on one machine, persistent control sockets, conditional git configs that auto-select the right key, and pinned known_hosts. No third-party tools.
Understanding Memory Metrics: RSS, VSZ, USS, PSS, and Working Sets
Why does
free show 1GB available but your app OOM’d? Why is RSS 4GB when your heap is 2GB? A complete taxonomy of memory metrics from system level (total, available, cached) to process level (RSS, PSS, USS, WSS) to allocator internals.Mastering ZSH: Part 1 - Hooks and Automation
Complete guide to ZSH hooks: automate prompts, time commands, activate virtualenvs on cd, and filter secrets from history–without slowing down your terminal.