Introduction FTP (File Transfer Protocol) is a standard network protocol used for transferring files between a client and a server on a computer network. An FTP server is a software application that enables clients to upload and download files to and from the server. One popular open-source FTP server is VsFTP, which provides a range of features for managing and securing file transfers. In this article, we will discuss the key features and benefits of VsFTP, as well as common interview questions and answers about this FTP server. Whether you are a system administrator looking for a secure and stable ... Read More

Introduction Penetration testing is a crucial aspect of securing modern systems and networks. It helps identify potential vulnerabilities that attackers can exploit. With the growing complexity of systems and the plethora of attack vectors available, the tools used for penetration testing have evolved over the years. One such tool, Evil-WinRM, has become a go-to tool for pentesters when it comes to attacking Windows-based systems. What is Evil-WinRM? Evil-WinRM, an open source penetration testing framework, is designed to provide an easy and efficient way to automate various tasks and run complex commands on a remote Windows machine. It is a powerful ... Read More

Introduction On Linux, there are several ways to recursively remove files with a specific extension (.xyz) in a directory and its subdirectories. Deleting files recursively means deleting all files with the specified extension from the directory and all of its subdirectories. This operation can take a long time if done manually, especially for a large number of files. In this article, we will look at three methods to recursively delete files with a specific extension on Linux. Using the rm command The rm command is a basic file manipulation tool in Linux used to remove files and directories. It can ... Read More

Introduction The tr (translate) command is a Linux utility that allows you to perform various transformations on text input. Whether you need to change case, remove repeating characters, remove characters, set complements or remove newline characters, tr can handle it all. In this article, we'll explore the various options available with the tr command and show you how to use them to transform text. Syntax of tr Command The basic syntax of the ‘tr’ command is as follows − $ tr SET1 SET2 < inputfile where − SET1 is a set of characters to be replaced by the ... Read More

Introduction As a Linux user, it's common to run the same command in multiple directories. For example, you might want to search for all files with a certain extension or run a shell script in multiple directories. This task can be time-consuming if done manually, and becomes even more tedious as the number of directories increases. Fortunately, Linux provides several methods for running a command across multiple directories efficiently. In this article, we'll take a look at some of these methods and show you how to run a command on multiple directories in Linux. Using the Find Command to Execute ... Read More

Introduction Linux is a powerful and adaptable operating system with numerous features that make it suitable for both personal and business use. File permissions are one of these features that is very important because they let you control who can access and change your files. We'll take a closer look at Linux's advanced file permissions in this article, focusing on some of the most important ideas and commands. Setting File Permissions in Linux Understanding Linux file permissions starts with knowing how to set them. The chmod command, which stands for "change mode, " is used to accomplish this. Change the ... Read More

Introduction The ps command is a widely used utility in Linux that provides a snapshot of current processes and their status. It helps monitor running processes, identify process ID (PID), terminal type (TTY), CPU time usage, command name, user ID and other information. This article provides a comprehensive overview of the various use cases of the ps command in real life. Syntax of ps Command The basic syntax of the ps command is as follows − $ ps [OPTIONS] The ps command supports three different syntax styles: Unix, BSD, and GNU. Unix-style syntax can be wrapped and preceded by ... Read More

Introduction In Linux-based operating systems, there are many ways to search (find) and replace text in a file. Depending on the size of a file and the complexity of the find and replace operation, different tools and commands may be more appropriate. In this article, we'll learn a few different methods of finding and replacing text in Linux environments. Using the sed command to find and replace text The sed (stream editor) command line tool is another powerful tool that can be used to find and replace text in files on Linux. This tool is often used to perform more ... Read More

If you are a Linux user or administrator, you might have heard of term "BCC tools" or "BPF Compiler Collection." BCC is a powerful set of dynamic tracing tools that provides a simple yet effective way to monitor system performance, networking, and much more. In this article, we will discuss what BCC tools are, their benefits, and how to use them with examples. What are BCC Tools? BCC (BPF Compiler Collection) is a set of dynamic tracing tools built on top of eBPF (extended Berkeley Packet Filter) technology in Linux kernel. eBPF is a virtual machine that runs inside kernel ... Read More

As a developer, you might find yourself using command line interface (CLI) quite often. CLI allows you to interact with your computer through a terminal window and run commands to perform tasks. One of most popular shells used in CLI is Bash shell. Bash is a powerful tool, but it can be overwhelming to manage your scripts, aliases, and functions. This is where Bash-it comes in. Bash-it is a framework for managing your Bash configuration files. It provides a collection of scripts, aliases, and functions that you can use to customize your Bash environment. With Bash-it, you can easily control ... Read More