The Linux command line has many tools that we can use to extract information from text files. In this tutorial, we’ll use a few different methods to extract email addresses from a text file on Linux.
programming
C++ code on how to read characters from a file
This tutorial will show you a small example of C++ code on how to read a characters from a file, as well as to count the number lines that any particular file consist of. We will be creating the script and compiling the C++ on a Linux system. All distros will work the same, provided you have the G++ compiler installed, which we will cover as well.
How to use bash array in a shell script
In this tutorial we will see how to use bash arrays and perform fundamental operations on them. Bash, the Bourne Again Shell, it’s the default shell on practically all major linux distributions: it is really powerful and can be also considered as a programming language, although not as sophisticated or feature-reach as python or other “proper” languages. Furthermore, the Bash scripting is a must skill for any Linux system administration job.
How to check CentOS version
There are several ways on how to check what version of CentOS is running on your system. The simplest way to check for the CentOS version number is to execute the cat /etc/centos-release command. Identifying the accurate CentOS version may be required to help you or your support team to troubleshoot your CentOS system.
How to convert binary number to decimal with python
In this guide, we will show you a short script that can be used to convert a binary number to a decimal number in Python on Linux. This script uses casting which is used to convert a variable from one type to another. In this case, we use Python casting to convert a string to decimal number that is an integer.
Check out the script below to use it on your own system.
In this tutorial you will learn:
- How to convert binary number to decimal with Python
Introductory tutorial to Git on Linux
Git is without doubt the most used version control system in the world. The software is open source, released under the GPLv2 license, and was created by Linus Torvalds, which is also the father of Linux. In this tutorial we learn
the basic concepts behind its usage, we see how to create or clone a git repository and how to perform the basic actions involved in the git workflow.
In this tutorial you will learn:
- The basic git concepts
- How to create a git repository
- How to clone a git repository
- How to add file contents to the repository index
- How to create a commit
- How to push changes to a remote repository
- How to pull changes from a remote repository
Introductory tutorial to Git on Linux
C++ function to calculate Fibonacci number sequence
In this artcile you will learn how calculate Fibonacci sequence with using C++ function. The Fibonacci sequence starts with 0 and 1 where the the following number is always a sum of the two preceding numbers. For example, 0,1,1,2,3,5,8 and so on.
In this tutorial you will learn:
- How to compile Fibonacci C++ program
- How to run Fibonacci C++ program
Introduction to Ranger file manager
Ranger is a free and open source file manager written in Python. It is designed to work from the command line and its keybindings are inspired by the Vim text editor. The application has a lot of features and, working together with other utilities, can display previews for a vast range of files. In this tutorial we learn how to use it, and explore some of its functionality.
In this tutorial you will learn:
- How to install Ranger on the most used Linux distributions
- How to launch Ranger and copy its configuration files locally
- Ranger basic movements and keybindings
- How to visualize hidden files
- How to get preview of various types of documents
- How to create, access and remove bookmarks
- How to select files and perform actions on them
Get Started with Android application development using Linux and Android SDK
Developers interested in the Android mobile operating system are able to use the Android SDK and various IDE software to code applications. These apps can then be made available and marketed to Android users around the world.
There are a lot of choices when it comes to programming Android applications. Your coding environment can involve a Linux system and a variety of different IDE programs to facilitate all of the software development. The trouble here is that each Linux distribution will often have a different set of requirements to run the sofware, and a separate list of steps that need to be followed.
In this guide, we’ll go through the step by step instructions to install Android Studio – which is one of the most popular Android IDEs – on a Linux system. This will work on any distribution because we’ll be using Snap package manager to manage the installation. Love it or hate it, the Snap package manager gets your system ready for Android development very quickly, by handling all the dependencies and working identically on any distribution you’re running, whether it be Ubuntu, Debian, Red Hat, CentOS, AlmaLinux, openSUSE, or any other type of Linux system.
Follow along with us below as we setup Snap package manager, install Android Studio, and then program a Hello World Android application to verify that everything is working properly.
In this tutorial you will learn:
- How to setup Snap package manager
- How to install Android Studio and SDK packages
- How to create a Hello World test application
- How to run an Android application on an emulated device
How to Install Open-Source VSCode Without Telemetry on Linux
Visual Studio Code or VSCode is a text editor developed by Microsoft that supports many popular programming languages such as Go, Java, JavaScript, Node.js, Python, C and C++. It is a directory based, language agnostic source code editor which focuses on directories rather than projects and has many extensions available for it. VSCode’s feature set includes bracket matching, syntax highlighting, code folding, linting, debugging, and built in version control via Git, Subversion or Perforce. Ever since the initial release of VSCode in 2015, it has become an increasingly popular programming tool amongst users of all desktop operating systems including GNU/Linux.
How to work with the Woocommerce REST API with Python
WordPress is probably the most used CMS in the world (it is estimated that almost 40% of all websites are built using the platform): it is very easy to install and use, and allows even non-developers to create website in few minutes.
Wordpress has a very large plugin ecosystem; one of the most famous is Woocommerce, which allows us to turn a website into an online store in few steps. The plugin makes use of the WordPress REST API infrastructure; in this tutorial we will see how to interact with the Woocommerce API using the Python programming language, showing how to list, create, update and delete products and categories.
In this tutorial you will learn:
- How to generate Woocommerce REST API credentials and enable pretty permalinks
- How to interact with the Woocommerce REST API using Python and the woocommerce package
- How to get information about the existing Woocommerce categories, create, update and delete them
- How to get information about the existing Woocommerce products
- How to create simple and a variable products with variations
- How to update and delete a product
How to Discover, From Inside a Bash Script, the Path the Script Is In
When you develop complex Bash scripts and start putting various scripts into a folder, where one script interacts with another by, for example, starting it, it quickly becomes necessary to ensure we know the path the script was started from, so we can start the other scripts with a fully qualified pathname. This is important because the first script may have been started from outside the script’s directory. We could have also done so by using a relative path, so even – somehow – reading the command that started the current script will not work.
In this tutorial, you will learn:
- What the
pwdcommand is, and what it does - How to discover from inside a Bash script what path that same script is in