Introduction Sed, or Stream Editor, is a powerful command-line tool that allows you to manipulate and transform text files. One of most common tasks that you may need to perform is to replace a multi-line string in a file with another string. In this article, we will explore how to use sed to accomplish this task. Understanding Sed's s Command Sed's s command is primary tool that you will use to perform text replacements. It takes following form − s/pattern/replacement/flags Here, pattern is a regular expression that matches text that you want to replace, replacement is text that you ... Read More

Introduction Linux is an open-source operating system that provides users with a wide range of utilities and tools for managing and manipulating data. One such tool is join command, which is used to join two different files based on a common field. join command is a very useful utility that can be used to merge or join two files, where one file contains a list of unique fields and other file contains more detailed information about those fields. The Linux join command is a powerful tool that is used to merge two different files based on a common field. command ... Read More

Introduction Linux is an open-source operating system that provides a wide range of powerful and flexible tools for managing and manipulating files and data. One of essential tools in Linux is "comm" command, which is used to compare two sorted files line by line. This command can be used to identify common lines or differences between files. In this article, we will discuss comm command, its syntax, and examples. Syntax of comm Command The syntax of comm command is as follows − comm [OPTION]... FILE1 FILE2 Here, FILE1 and FILE2 are two files that need to be compared. options ... Read More

Bash is a powerful programming language used for writing shell scripts on Linux and other Unix-based systems. One of most common tasks in shell scripting is evaluating arithmetic expressions. In this article, we will discuss how to evaluate arithmetic expressions in Bash and explore some examples. Introduction Arithmetic expressions are mathematical calculations performed on numerical values. In Bash, arithmetic expressions are evaluated using expr command, which evaluates a string as an arithmetic expression and returns result. syntax for expr command is as follows − $ expr expression Here, expression is arithmetic expression to be evaluated. For example, to evaluate ... Read More

Introduction Working with files is a common task for Linux users, and often, you may need to find longest line(s) in a file. While there are several ways to do this, there are a few simple methods that can make process quicker and more efficient. In this article, we will explore various methods for finding longest line(s) in a file in Linux. Method 1: Using wc Command The wc (word count) command is a useful tool that can be used to count number of lines, words, and characters in a file. However, it can also be used to find length ... Read More

When it comes to working with command-line utilities in Linux, there are many tools and utilities available that can make your life easier. One such utility is xargs, a command that allows you to execute commands on a list of files, or arguments, from standard input. Xargs is particularly useful when you want to perform an operation on a large number of files, and you want to do it quickly and efficiently. In this article, we will discuss various scenarios where you may need to use xargs in Linux. We will also look at some examples to illustrate how to ... Read More

Introduction In today's era of technological advancements, use of computers and various electronic devices has become an essential part of our daily routine. We often find ourselves in situations where we need to compare two files to check if they contain same content or not. This can be a daunting task, especially if files are large in size, and traditional comparison methods can be quite time-consuming. In this article, we will explore fastest methods to check if two files have same contents. What is a File Comparison? A file comparison is a process of comparing two or more files to ... Read More

Locale Environment Variables in Linux Locale environment variables in Linux play a crucial role in enabling users to communicate effectively with operating system. locale environment variables are responsible for setting language, encoding, and cultural conventions in a system. In this article, we will explore different aspects of locale environment variables in Linux. What is a Locale? A locale is a set of parameters that define user's language, country, currency, and other cultural conventions. locale defines format of dates, time, and numbers, and character sets. For example, US locale uses dollar as currency symbol, while UK locale uses pound. Similarly, US ... Read More

Linux is a free and open-source operating system that is widely used in modern computing systems. It has a rich set of features that make it one of most popular operating systems in world. One such feature is use of swap space. Swap space is a part of Linux file system that is used to temporarily store data when computer's RAM (Random Access Memory) is full. In this article, we will discuss use of swap space in modern Linux systems, its benefits, and how to configure it. What is Swap Space? Swap space is a designated area on a hard ... Read More

Introduction Linux is a powerful operating system that provides users with a command-line interface to perform various tasks. One of essential tools in Linux is sudo command. sudo command allows users to execute commands as a superuser or another user with elevated privileges. This article will explore sudo command in Linux, its usage, and different examples of its application. Understanding Sudo Command Sudo stands for "SuperUser Do, " and it is a powerful command in Linux that allows users to execute commands with elevated privileges. Sudo command is used to run a command as a superuser or another user with ... Read More