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$ ip route show
default via 192.168.1.1 dev eth0 192.168.1.0/24 dev eth0 proto kernel 10.0.0.0/24 via 192.168.1.20 dev eth0
$
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ADB CommandsOpen technology index
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Fastboot Says “No Permissions”? Diagnose USB Before Editing udevADB Commands
Existing libraryA fastboot permission error is fixable, but only after you know Linux can see the bootloader. This diagnostic path separates USB, mode, tool, group, and udev-rule failures without normalizing sudo fastboot.
Who Is Really Logged In to This Linux Machine?Basic Linux Commands
Existing libraryThe who command can settle a tense “is anyone still using this server?” moment—provided you understand what its session records can and cannot prove.
Let the Linux tree Command Explain a DirectoryLinux Commands
Existing libraryTurn an unfamiliar directory into a readable map with tested tree commands for depth, filtering, metadata, symlinks, and machine-readable output.
Find the Right Files on Linux Without Fear of the ResultLinux
Existing libraryBuild predictable Linux find expressions for names, types, sizes, and file contents, then inspect every match safely before taking action.
Safely Rename Parts of Filenames and File ContentLinux
Existing libraryRenaming `memory_map.c` to `memory_mapping.c` and changing identifiers inside source files are separate operations. This guide previews both, handles unusual filenames, refuses collisions, keeps backups, and makes rollback practical.
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Clear filtersField guideLinux, OS Concepts and Networking
01List Files Installed by a Linux Package
Use the package database for installed ownership, repository content indexes for packages not installed, and archive queries for downloaded DEB/RPM files. These inventories describe packaged paths—not every file created later by services, scripts, or users.
Field guideBash / Shell Scripts
02Check 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.
Field guideLinux, OS Concepts and Networking
03Difference between Spinlock and Semaphore
Spinlocks Spinlocks assume the data you are protecting is accessed in both interrupt-handlers and normal kernel code. … Read more
Field guideLinux, OS Concepts and Networking
04Difference between Mutex and Semaphore
Besides the better readability, the code for mutex is smaller and slightly faster than the semaphore implementation. … Read more
Field guideLinux, OS Concepts and Networking
05What is Zombie process and How to create zombie process in Linux
Zombie process is the process which died immediately and whose parent didn’t cared to handled the status … Read more
Field guideLinux Host, Ubuntu, SysAdmin
06Encrypt directory in Linux using Encfs
EncFS creates a virtual encrypted filesystem which stores encrypted data in the rootdir directory andmakes the unencrypted … Read more
Field guideDevelopment Environment Setup
07Install latest version of Node JS on Ubuntu
If you want to install node.js which is gaining popularity in recent days, you can follow below … Read more
Field guideDevelopment Environment Setup
08Install specific Node JS version on Ubuntu
To install specific version of Node JS, first make sure NPM package manager is installed. You can … Read more
Field guideCommands and Packages
09Identify which process keeps port busy on android / Linux
Lets say you are trying to do something with UPNP which reserves port 1900 for all of … Read more
Field guideCore Kernel
10Compile and Install device-tree-compiler (DTC) On Ubuntu
If you want to install device-tree-compiler i.e. dtc command on Ubuntu, use following command, This command will … Read more
Field guideCommands and Packages
11Find the package that provides a file in Ubuntu
If you want to identify some binary belongs to which package in Ubuntu in certain situations when … Read more
Field guideCore Kernel
12What is Linux Out-Of-Memory OOM Killer
Major distribution kernels set the default value of /proc/sys/vm/overcommit_memory to zero, which means that processes can request … Read more
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