How to Compile the Linux Kernel from Source
Compile custom Linux kernel images from source: master make menuconfig, kernel config tuning, make -j$(nproc), modules_install, and GRUB updates.
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Linux Kernel
Linux Kernel
Fix BRLTTY Disconnecting USB Serial COM Ports on Ubuntu
Stop BRLTTY daemon from claiming CH340 / FTDI USB serial COM ports in Linux: disable udev rules, mask brltty.service, and restore ttyUSB access.
How to Test a USB to RS-232 Serial Adapter in Linux
Test and debug USB to RS-232 serial adapters on Linux: identify /dev/ttyUSB0 nodes via dmesg & lsusb, loopback test with picocom, minicom, or screen.
How to Install Arduino IDE on Ubuntu Linux
Install Arduino IDE on Ubuntu Linux: download AppImage / Flatpak binaries, add dialout group permissions for ttyUSB/ttyACM, and configure board managers.
How to Enable ALOGV Verbose Native Logs in Android Logcat
Enable ALOGV verbose native logs in Android C/C++ HAL layers: set LOG_NDEBUG 0, configure setprop log.tag.<TAG> VERBOSE, and inspect Android Logcat.
Virtualization Technologies in Embedded Linux Systems
Explore virtualization technologies in embedded linux: compare KVM hypervisors, Xen ARM virtualization, LXC containers, and Docker for real-time systems.
How to Use usbutils for USB Hardware Diagnostics on Linux
Master usbutils tools on Linux: inspect USB bus topologies with lsusb -t, parse descriptor trees (lsusb -v), debug endpoint speeds, and reset USB devices.
Understanding releasekey.x509.pem in AOSP Build Signing
Understand AOSP releasekey.x509.pem APK and OTA firmware signing: replace default test keys, configure sign_target_files_apks, and secure production builds.
How to Use the whoami Command in Linux
Learn how to use the whoami command in Linux: verify active shell user IDs, compare whoami vs id -u vs logname, and troubleshoot sudo environment contexts.
How to Clear Bash Shell History in Linux
Clear Bash shell history in Linux: delete ~/.bash_history logs, run history -c, disable history logging for sensitive commands, and purge env secrets.
What is stty and How to Configure Terminal Settings in Linux
Master the stty command in Linux: configure terminal line settings, disable echo for password inputs, reset frozen terminals, and adjust baud rates.
How to Add a Custom Device Class in the Linux Kernel
Create a custom device class in Linux kernel modules: master class_create(), device_create(), sysfs node creation under /sys/class/, and cleanup.
Understanding the 4 GCC Compilation Stages in Linux
Master the 4 stages of GCC compilation in Linux: Preprocessing (-E), Compilation (-S), Assembly (-c), and Linking (-o) with ELF object inspection.
How to Decode QR Codes from Terminal in Ubuntu Linux
Decode QR codes and barcodes from the terminal in Ubuntu Linux: use zbarimg CLI, process image files, and extract decoded text payload streams.
How to Discover UPnP / DLNA Devices on Network in Linux
Discover UPnP and DLNA media devices on local Linux networks: query SSDP multicast packets using gssdp-discover and nmap UPnP discovery scripts.
How to Check USB Web Camera Resolutions in Linux Terminal
Query USB web camera supported resolutions and pixel formats in Linux: use v4l2-ctl --list-formats-ext and ffmpeg to inspect /dev/video0 capabilities.
How to Identify and Clear Zombie Processes in Linux
Identify defunct zombie processes in Linux using ps aux and top, understand waitpid() parent failures, and send SIGCHLD or restart parent processes.
How to Use ADB Shell Commands on Android
Master ADB shell commands on Android: open interactive shell, execute pm list packages, inspect dumpsys services, capture logcat logs, and run shell scripts.
How to Fix dtc: Command Not Found Error in Linux
Fix dtc: command not found error in Linux: install device-tree-compiler on Ubuntu/Debian, compile Device Tree Source (.dts) to binary blob (.dtb).
How to Read a File Line by Line in Bash
Read text files line by line in Bash: master while IFS= read -r line; do ... done < input.txt loop pattern, handle missing trailing newlines, and process fields.
How to Check if a File or Directory Exists in Bash
Check if files or directories exist in Bash scripts: use test operators [[ -f file ]], [[ -d dir ]], [[ -e path ]], [[ -s non-empty ]], and negation [[ ! -f ]].
How to Write Comments in Shell Scripts (Single & Multi-line)
Write single-line and multi-line comments in Bash shell scripts: use # hash symbols, heredoc block comments (<< 'EOF'), and inline command documentation.
How to Get Linux System Uptime in C
Query Linux system runtime and uptime in C: master POSIX sysinfo(&info) struct, calculate days/hours/minutes, and read /proc/uptime.
How to Read Files in a Directory in C (dirent.h)
Traverse and read directory files in C: master POSIX opendir(), readdir(), closedir(), struct dirent, and file type checking (DT_REG, DT_DIR).