Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
How to get a Docker container's IP address from the host?
If you are working with Docker for a long time now, you might already have lots of containers running in your host machine. At times, it becomes really difficult to keep track of all these containers. Moreover, if you are on a network or using compose, there might be several containers running inside the network. In such a case, determining which container is actively running and which has failed, is very difficult. You might need to ping these containers periodically to check their status. For this, you need to have the IP addresses of the containers. You can easily ...
Read MoreHow to List All Connected SSH Sessions on Linux
Secure Shell (SSH) is a commonly used protocol for secure remote access to Linux servers. When multiple users are connected to a Linux server via SSH, it can be useful to list all connected SSH sessions for administrative or monitoring purposes. In this article, we will discuss how to list all connected SSH sessions on Linux using various command-line tools. Using the who Command The who command is a simple and widely available command-line tool for listing logged-in users on a Linux system. To list all connected SSH sessions, you can use the who -a command. The -a ...
Read MoreTop skills that would be handy before taking up a technical role
Getting through all the tedious interview rounds of big tech giants for internships and jobs is in itself a big task. But once you clear the interview rounds and secure a job or an internship, the journey does not end there. In fact, this will be the time you need to upskill yourself in order to keep up with the pace of shift in technological stacks that the tech industry goes through. In this article, we will be discussing top skills that would be very handy if you would learn it before taking up the job or internship position. ...
Read More5 Tools to Encrypt Decrypt and Password Protect Files in Linux
In today's world, data privacy is more important than ever. With a multitude of online threats, it's crucial to keep your personal and professional data safe and secure. One of the best ways to do this is by using encryption and password protection. If you're a Linux user, you're in luck because Linux offers several powerful tools to encrypt, decrypt, and password protect your files. In this article, we'll discuss the best tools available in Linux and how to use them. GPG (GNU Privacy Guard) GPG is a free and open-source encryption tool that uses the OpenPGP standard. ...
Read MoreHow to join lines of two files on a common field in Linux?
To join lines of two files on a common field, we use the join command in the Linux system. The join command is used to merge lines from two sorted files based on a common field. Instead of physically combining files, the join command creates output by matching corresponding fields from both files. By default, the join field is the first field, delimited by whitespace. Syntax The general syntax of the join command is as follows − join [OPTION]... FILE1 FILE2 Note − If FILE1 or FILE2 is not specified, the join command reads ...
Read MoreStructure of a Client Server System
In client-server computing, the clients request a resource and the server provides that resource. A server may serve multiple clients at the same time while a client is in contact with only one server. This architecture forms the backbone of modern distributed systems, web applications, and enterprise software. The different structures for two-tier and three-tier architectures are given as follows − Two-Tier Client/Server Structure The two-tier architecture primarily has two parts: a client tier and a server tier. The client tier sends a request to the server tier and the server tier responds with the desired information. ...
Read MoreUser Mode vs Kernel Mode
User mode and kernel mode are two distinct operating modes that ensure system security and stability. The CPU switches between these modes to control access to system resources and prevent unauthorized operations that could crash the system or compromise security. User Mode In user mode, applications run with restricted privileges and cannot directly access hardware or critical system resources. When a user program needs system services (like file I/O or memory allocation), it must request help from the operating system through system calls. The mode bit is set to 1 in user mode. Key characteristics include: ...
Read MoreSystem Calls in Unix and Windows
System calls provide the interface between a process and an operating system. They are available as assembly language instructions and serve as the only mechanism for user programs to access kernel services. System calls are similar to function calls but transfer control from user mode to kernel mode. How System Calls Work When a process needs operating system services, it makes a system call which triggers a software interrupt. The CPU switches from user mode to kernel mode, executes the requested service, and returns the result to the calling process. This mechanism ensures security and controlled access to ...
Read MoreHow to list the directory content in Linux?
In the Linux operating system, there are two primary commands available to list directory contents: ls (list) and dir (directory). Both commands serve similar purposes but differ in their output formatting and default behavior. The ls Command ls (list) is the most commonly used command to list directory contents in Linux systems. By default, it displays the contents of the current directory with colored output for better readability. The ls command is also available in EFI (Extensible Firmware Interface) shell environments. Syntax $ ls [OPTION]... [FILE]... Common ls Options ...
Read MoreHow to list containers in Docker?
Managing multiple Docker containers in a single host machine through a single command line can become tough. Hence, it’s better to know the Docker commands to manage containers the best possible way. Docker provides us with many command line tools and utilities to manage containers. In this article, we will discuss how to list Docker containers through multiple ways. We will also look at how to filter the list output to get the desired results. Listing Docker Containers Predominantly, there are two major commands that you can use to display a list of all containers − ...
Read More