Flash Yocto Images to Raspberry Pi SD Card Using DD: Step-by-Step Guide
Flash custom Yocto Linux build images to Raspberry Pi SD cards: identify /dev/sdX disk nodes, execute dd bs=4M status=progress, and verify boot partition.
Lynxbee topic
Linux Commands
Set value for ro.sf.lcd_density in android with display 1280*800
Configure ro.sf.lcd_density system property in Android for 1280x800 displays: calculate DPI scale values, edit build.prop, and set SurfaceFlinger density.
Use hexedit to View and Edit Binary Files in Hexadecimal
View and edit raw binary ELF files using hexedit terminal utility: inspect byte offsets, edit ASCII strings, and patch executable byte patterns.
What is the Watermark and importance of Watermark
Understand digital image watermarks: protect media copyrights, embed brand logos, automate batch watermarking via ImageMagick, and prevent image theft.
Delete first few characters in each line in a text file using VI
Delete the first N characters of every line in Vim / Vi editor: use visual block mode (Ctrl + v), execute :%s/^...//, or use sed 's/^.\{3\}//'.
Resolve: Media Player Stops / Hangs the Ubuntu Linux while Video Playing
Fix media player video playback freezes on Ubuntu Linux: configure VA-API / NVDEC hardware acceleration, switch Xorg vs Wayland, and update Mesa.
Remove WordPress Hosting Site from Ezoic
Remove WordPress sites from Ezoic ad network integration: restore Cloudflare NS name servers, purge Ezoic CDN caching, and clean up WP plugins.
Security exception: uid does not have android.permission.MANAGE_APP_OPS_MODES.
Fix "SecurityException: uid does not have android.permission.MANAGE_APP_OPS_MODES": configure AOSP system app permissions and appops CLI overrides.
Linux Command “Top”: Understanding and Using the System Monitoring Tool
Master the Linux top command: monitor real-time CPU usage, memory utilization (VIRT, RES, SHR), process states, load averages, and sort by PID.
Duplicate Pages and Posts in WordPress Without Re-creating Content
Duplicate posts, pages, and custom post types in WordPress without plugin bloat: use Yoast Duplicate Post plugin or custom PHP functions in functions.php.
Exclude website directory from redirecting using .htaccess rewrite rules
Exclude specific website subdirectories or API paths from global Apache .htaccess URL redirection rules: configure RewriteCond %{REQUEST_URI} !^/dir/.
Understanding Very basic C Program and its execution in Ubuntu Linux – Part 1
Understand C program execution mechanics in Linux: trace preprocessing (#include), GCC compilation (-S), assembly (-c), linking (-o), and _start.
Sign kernel module on UEFI Secure boot enabled Ubuntu
Sign out-of-tree kernel modules (.ko) on UEFI Secure Boot Ubuntu: generate X.509 MOK keys using openssl, enroll MOK via mokutil, and sign modules.
Identify and Set Maximum values for ABS_X/ABS_Y OR ABS_MT_POSITION_X / ABS_MT_POSITION_Y
Configure Linux input event maximum axis bounds for ABS_X/ABS_Y and ABS_MT_POSITION_X/ABS_MT_POSITION_Y touchscreen drivers using evtest and libinput.
Identify Activity Name and Start the Activity of Installed App
Identify launcher Activity names and start installed Android apps via ADB shell: run adb shell am start -n com.example.app/.MainActivity.
Adb shell command to get Current Activity Name (Foreground / Top Activity )
Find active foreground Android app Activity names via ADB shell: run adb shell dumpsys activity dumpsys window | grep -E "mCurrentFocus|mFocusedApp".
Solved : Failure INSTALL_FAILED_SHARED_USER_INCOMPATIBLE “tried to change user”
Fix "INSTALL_FAILED_SHARED_USER_INCOMPATIBLE: tried to change user": resolve android:sharedUserId conflicts, sign app with platform keys, or uninstall.
Solved: ServiceManager: Permission failure: android.permission.ACCESS_SURFACE_FLINGER
Fix "ServiceManager: Permission failure: android.permission.ACCESS_SURFACE_FLINGER": configure SELinux policy rules and system UID permissions in AOSP.
How Yocto build Software Package from source code
Understand Yocto Project package compilation stages: trace do_fetch, do_unpack, do_patch, do_configure, do_compile, and do_install in BitBake.
Retrieve File Metadata in C with stat System Call
Retrieve file metadata in C using POSIX stat() system call: inspect st_size, st_mode permissions, st_uid/st_gid, and access/modification timestamps.
Linux USB Composite Gadget Architecture: ConfigFS, Drivers, and Execution Flow
Explore Linux USB composite gadget architecture: ConfigFS setup scripts, struct usb_function kernel driver flows, UDC bindings, and endpoint allocation.
Querying Network Interface Details by Name in Go (net.InterfaceByName)
Write a Go program using net.InterfaceByName to lookup IP addresses, MAC hardware addresses, MTU, and status flags for a specific network interface.
Inspecting Linux Network Interfaces, MACs, and IP Addresses in Go
Learn how to enumerate network interfaces, inspect MAC addresses, extract IPv4/IPv6 CIDR subnets, and check interface status flags using Go.
Monitoring Linux File System Events in C with inotify System Calls
Write a C program in Linux using inotify_init and inotify_add_watch to monitor directory file creation, modification, and deletion events in real time.