Check Internet Connection Using a Bash Script
For automation, cron jobs, or IoT devices, you often need to verify internet connectivity before continuing. Here are three bash methods to do it.
Lynxbee topic
lynxbeedev
Fix Git Error “fatal: unknown index entry format 0x16700000” (Quick Solution)
You’re trying to run a basic Git command—like git status, git add, or git commit—but Git suddenly … Read more
Implement an IRQ Interrupt Handler in a Linux Kernel Driver (Full Guide)
Interrupts are vital for real-time responsiveness in Linux kernel modules. Whether you’re writing drivers for GPIOs, network … Read more
Breakpoints in GDB: Set, Manage, and Use Like a Pro (Linux Debug Guide)
GDB (GNU Debugger) is the go-to tool for debugging C and C++ programs on Linux. One of … Read more
How to Fix "undefined reference to _exit" in ARM GCC Linker
Fix the undefined reference to _exit error in bare-metal ARM GCC builds: learn specs flags (--specs=nosys.specs, rdimon.specs) and custom syscalls.
How to Use GDB to Debug C Functions Across Multiple Files
Learn how to debug multi-file C applications using GDB: master gcc -g debug symbols, breakpoints by filename (break file.c:line), and stack frames.
How to Set Up Material Components Theme in Android (Material 3)
Set up Material 3 (Material Design) themes in Android: configure styles.xml, Theme.Material3.DayNight, color attributes, and dynamic colors.
How to Show AlertDialog with Single-Choice Options in Android
Build interactive AlertDialog popups in Android with MaterialAlertDialogBuilder: single-choice radio lists, multi-choice checkboxes, and event listeners.
Grep and Replace Strings in Source Code via the Linux Command Line
Use grep , sed , and find to search and replace strings across a codebase instead of doing it manually. Step 1: Find a String with grep -r — recursive -n — shows line numbers -w — matches whole word -e — the pattern Step 2: Replace a String in One File with sed -i — edits in place s — subs
How to Add SHA-1 & SHA-256 Fingerprints to Firebase for Phone Auth
Configure SHA-1 and SHA-256 keystore fingerprints in Firebase Console for Android Phone Auth, Google Sign-In, and App Check verification.
🔥 How to Integrate Firebase into Your Android App (Complete 2025 Guide)
Firebase by Google offers a powerful set of tools to help you build, grow, and scale Android … Read more
How to Create and Set Up a New Firebase Project in Console
Step-by-step guide to creating a new Firebase project in Firebase Console: configure Google Analytics, register web/mobile apps, and download config.
What is Nginx? How to Install and Configure It on Ubuntu
Learn what Nginx is and how to install it on Ubuntu 22.04/24.04: master systemctl service commands, UFW firewall rules, and virtual host server blocks.
Build a Python WSGI Application and Deploy It with uWSGI
Build a raw PEP 3333 Python WSGI web application from scratch and deploy it with uWSGI and Nginx: sockets, emperor mode, and systemd setup.
How to Add a Fixed Floating Action Button (FAB) in CSS
Create a fixed floating action button (FAB) in CSS: master position fixed, z-index layering, safe-area-inset padding, and accessibility ARIA states.
Meta Ads vs Google Ads: Developer & SaaS Technical Comparison
Compare Meta (Facebook) Ads vs Google Search Ads for tech products: evaluate intent vs discovery, CAC metrics, retargeting pixels, and conversion tracking.
How to Enable SELinux Permissive Mode in Android AOSP
Configure SELinux permissive mode in Android AOSP builds: master BoardConfig.mk BOARD_KERNEL_CMDLINE flags, bootimg options, and audit2allow policy fixes.
How to Fix GRUB Rescue Prompt (`grub>`) in Linux
Recover your Linux system from the grub rescue prompt: locate root partitions (ls, set root, prefix), load normal module, insmod, and update-grub.
How to Use repo forall for Multi-Repository Git Diffs in AOSP
Generate Git diffs across multi-repository AOSP trees using repo forall: master command syntax, tag comparisons, project variables, and patch generation.
Understanding /proc/meminfo: Linux Kernel Memory Metrics
Decode /proc/meminfo metrics in Linux: understand MemAvailable vs MemFree, Active/Inactive anonymous memory, Buffers/Cached, Dirty pages, and Swap.
Solved: {“non_field_errors”: [“Expected a list of items but got type “dict”.”]}
Developers working with Django REST Framework (DRF) often encounter serialization issues when handling nested objects or ManyToMany … Read more
Solved: The .create() Method Does Not Support Writable Nested Fields by Default
Developers working with Django REST Framework (DRF) often encounter the error: “The .create() method does not support … Read more
Comparing Files with Vim's vimdiff Tool
Vim has a built-in diff mode (vimdiff) for side-by-side file comparison, useful for backporting changes between versions of the same file. Example Files Create filename1.c : And filename2.c , which adds a function: Diff the Files Lines with no background difference are identical.
How to Create a Custom Yocto Meta Layer Manually
Step-by-step guide to manually creating custom Yocto Project meta layers: configure layer.conf, BBPATH, BBFILES, bitbake-layers, and recipe structure.