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Linux

Essential Open-Source Linux Tools for Systems Debugging & Performance Profiling

Master essential open-source Linux performance and debugging tools: strace, ltrace, perf, Valgrind, iostat, ss, and iperf3 with command workflows.

How to Set Up TFTP Server on Ubuntu (tftpd-hpa Guide)

Set up a TFTP server on Ubuntu using tftpd-hpa: learn configuration, permission fixes, ufw firewall setup, and U-Boot embedded kernel image transfers.

How to Capture USB Packets in Wireshark on Linux (usbmon)

Sniff USB traffic on Linux using Wireshark and the usbmon kernel module: step-by-step setup, non-root udev permissions, and USB URB display filters.

Building Kernel Modules In-Tree During Kernel Compilation

Kernel modules are usually built out-of-tree, but for modules tightly coupled with kernel internals it's better to build them in-tree, as part of the kernel compilation itself, for header and config compatibility and automatic compilation during make . The example below uses linux-5.10/ as the so

Function Pointers in C: Syntax, Callbacks, and Real Examples

Master C function pointers: learn syntax, typedef declarations, qsort() callbacks, POSIX signal handlers, kernel vtables, and memory mechanics.

C Array of Pointers to Strings: Complete Syntax & Examples

Master array of pointers to strings in C: compare 2D arrays vs char* arrays, dynamic malloc allocations, memory layouts, and qsort string sorting.

Mastering Array Passing in C: Pass Arrays & Elements to Functions

Learn how to pass arrays and individual elements to functions in C: master array decay, const protection, 2D matrix stride, and VLA parameters.

Why Use Arrays in C: Memory, Cache & Performance Benefits

Discover why arrays are essential in C: contiguous memory allocation, O(1) index math, CPU cache line prefetching, and hardware DMA buffers.

How to Set Tab to 4 Spaces in Vim (.vimrc Config Guide)

Configure Vim and Neovim for 4-space indentation: master tabstop, shiftwidth, softtabstop, expandtab, and filetype-specific .vimrc settings.

Bitwise Operators in C: Embedded Bit Manipulation Guide

Master C bitwise operators (&, |, ^, ~, <<, >>): learn bit masking, clearing flags, RGB byte extraction, and embedded GPIO register manipulation.

How to Run Linux Background Scripts with GNU Screen

Keep shell scripts running after SSH disconnects using GNU Screen: master screen -S, detach (Ctrl+A d), reattach (-r), logging (-L), and nohup vs screen.

Array of Structures in C: Memory Layout & Production Examples

Master array of structures in C: learn contiguous memory layout, struct padding, pointer arithmetic, dynamic heap allocation, and qsort sorting.

Structure Initialization in C: Designated Initializers & Best Practices

Master C struct initialization: zero-initialization ({0}), designated initializers (.field = val), compound literals, and C99 memory alignment.

Bitfields in C: Memory Packing & Hardware Register Control

Master C bitfields for memory-constrained embedded systems: learn bit packing syntax, struct alignment, volatile registers, and portability gotchas.

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