Bash scripting is a powerful tool for automating repetitive tasks, making it a core skill for anyone working with Linux systems. Among the essential techniques is managing variables that increment automatically, especially in loops or iterative processes. In this tutorial, we’ll focus on how to increment variables in bash bash scripts, exploring different ways to handle counters, increments, and loops.
Programming & Scripting
Bash script: Shebang usage and best practices
If you have looked at some of our Bash script examples across our website, or seen some others online to learn from, you may have noticed that all of the Bash scripts begin with a shebang.
Removing duplicate lines from a text file using Linux command line
Removing duplicate lines from a text file can be done from the Linux command line. Such a task may be more common and necessary than you think. The most common scenario where this can be helpful is with log files. Oftentimes log files will repeat the same information over and over, which makes the file nearly impossible to sift through, sometimes rendering the logs useless.
In this guide, we’ll show various command line examples that you can use to delete duplicate lines from a text file. Try out some of the commands on your own system, and use whichever one is most convenient for your scenario.
In this tutorial you will learn:
- How to remove duplicate lines from file when sorting
- How to count the number of duplicate lines in a file
- How to remove duplicate lines without sorting the file
Bash Scripting Tutorial: How to Write a Bash Script
The Bash shell is one of the most powerful components of a Linux system, as well as one of the most compelling reasons to use Linux. Users can interact with Bash through the command line, and write scripts to automate tasks. Although this may sound intimidating to beginning users, it is not hard to get started with Bash scripting.
Random Entropy in Bash
When using random numbers in Bash, the question of random entropy will sooner or later come up. This article will help you understand what entropy is, how it can be modified and optimized in Bash, and how it will affect random number generation.
In this tutorial you will learn:
- How to generate random entropy in Bash
- How to pre-seed the random number generator in Bash
- Examples demonstrating random entropy generation in Bash
How to install the Zed code editor on Linux
Zed is a high-performance, “multiplayer”, free and open source code editor written in Rust and developed in the open on GitHub. It was created by the same authors as the Atom text editor, and although it has IDE features, it is very responsive. In this tutorial, we learn how to install Zed on some of the most used Linux distributions.
Calculate column average using bash shell
The purpose of this tutorial is to show how the Bash shell can calcuate the average value of a single column of a text file on a Linux system.
Introduction to GNU R on Linux Operating System
Introduction
This article will deal mainly with the installation of R on Linux, but also will provide a simple example on how to use R for plotting. This is the first article of the series of R articles so subscribe to our RSS feed for regular updates. Everyone, who is interested in using R for their work or is simply interested in this software is invited to follow this series of articles. The main objective of these articles is to provide a quick reference to R with illustrative examples.
What is GNU R?
R is an open source programming language (software package) and environment used mainly for statistical data analysis. It is licensed under the GNU General Public License (GPL). R is a very intuitive programming language. You can do in a few lines of R code a lot, mainly because there is a large number of packages available for R, which means a large number of preprogrammed functions for you to use. You can get R packages through Comprehensive R Archive Network (CRAN).
R’s strengths are: graphical visualization of data such as plots, data analysis, statistical data fits.
R’s weaknesses are: complex structured data storage, querying data, dealing with large data sets, which do not fit in the computer’s memory.
Installing GNU R on Linux/Unix.
Package Management System
Debian / Ubuntu / Mint
On Debian like Linux systems such as Debian, Ubuntu or Linux Mint you can install R from standard repositories. This is a preferred way of getting R installed on your system. The command bellow will download and install R along with all its prerequisites:
$ sudo apt-get install r-base
Bash Script: Hello World Example
When getting started with a new scripting or programming language, such as Bash scripting on Linux, the first thing a user learns to create is a Hello World script.
Useful Bash Command Line Tips and Tricks Examples – Part 6
In this article we have a look at obtaining some basic hardware, system and operating system configuration information directly from the command prompt in your terminal. Having this information, and knowing where to find it, often helps when configuring a system, researching optimal hardware and software solutions, and generally being in control of the Linux system you own or manage.
We will focus mostly on every day information, the kind that is required on a regular basis. Going more in-depth often requires a few online searches to first define alignment better, and then often requires additional skills to interpret the results or output shown.
For example, we will not be looking at the output of vmstat, though we will discover how to find out what CPU is in your system without opening the hood. We will also look at some basic resource limit variables and surrounding concerns. The target audience for this article is thus beginner to medium advanced.
This article is part of the Useful Bash Command Line Tips and Tricks Series.
In this tutorial you will learn:
- Useful Bash command line tips, tricks and methods
- How to interact with the Bash command line in an advanced manner
- How to sharpen your Bash skills overall and become a more proficient Bash user
