Packaging cmatrix with quilt for PPA (upstream packaging tutorial)
In this tutorial, you’ll: Take an upstream tarball (cmatrix 2.0 from GitHub) Create minimal Debian packaging files by hand (and with dch) Use quilt to add a small patch Build…
Packaging cmatrix with quilt (local upstream packaging tutorial)
In this tutorial, you’ll learn how to: Take an upstream tarball (cmatrix 2.0 from GitHub) Create minimal Debian packaging files by hand Use quilt to add a small patch Build…
Key Management for Launchpad (GPG + SSH)
Launchpad uses two types of keys: OpenPGP (GPG) keys → required for signing packages uploaded to a PPA SSH keys → required for secure access, such as pushing to Launchpad…
OPNsense WAN Watchdog with Cooldown, Log Rotation & Cron Integration. PART 1
The following guide is for OPNsense 25.7.7_4 In part 1 we will explore the creation of a cron activated recovery script. A complete guide to automatically recover DHCP outages Some…
The Secret Hierarchies of Excel: Why Managers Merge, and Engineers Cry
At first glance, it looks deceptively simple, “fill down Excel cells.”But that innocent-sounding task hides one of the most persistent, high-friction data problems in business: the hierarchical Excel sheet. Every…
One Million Rows: Testing xlfilldown Performance and Constant-Memory Design
TL;DR — Key Takeaways 1,000,000-row stress test, real Excel limitsFlattened a full-size workbook (1,000,000 rows × 5 cols) on a laptop without a single memory spike. Performance Excel → Excel:…
xlfilldown: the complete guide ( Excel Fill Down )
xlfilldown streams an Excel sheet into SQLite or a new Excel sheet, forward-filling selected columns by header name (or letters), optionally keeping original Excel row numbers and computing a stable…
How I Repaired a DXRacer Tilt Mechanism When Spare Parts Were Unavailable
⚠️ Disclaimer ⚠️ This guide is shared for informational purposes only. Attempt any repair at your own risk. I am not responsible for injury or damage that may result from…
OPNsense: Automatic Recovery When WAN Fails
Please visit the following updated tutorial.Turns out opnsense overwrites the cron entry so we need to take some extra steps.The following guide is for OPNsense 25.7.7_4 https://rexbytes.com/2025/11/14/opnsense-wan-watchdog-with-cooldown-log-rotation-cron-integration-part-1/ Introduction Firewalls and…
Running OPNsense on the HP T740 — Fixing GIANT-LOCKED and Power Recovery Issues
Fixing “GIANT-LOCKED” Boot Issue on HP T740 with OPNsense Symptom When booting OPNsense (or FreeBSD-based systems) on an HP T740 thin client, the system may freeze during device probe, showing…
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