Language Selection

English French German Italian Portuguese Spanish

Programming Leftovers

Submitted by Roy Schestowitz on Tuesday 24th of August 2021 09:59:17 AM Filed under
Development
  • If Conditions in Ruby

    Decision-making is a base factor in programming and human life. They allow us to perform certain actions when a condition fits a specific scope.

    In this tutorial, we will focus on how to implement condition statements in Ruby programming language. Using Ruby conditionals, we can check for a specific condition and take a specified action based on the result.

    The simplest way to make a single decision in Ruby is to implement an if statement.

  • Let's write a compiler, part 7: Arrays

    Arrays are an important feature for our language and compiler. Not defined in the original PL/0 specification but later added in its successor language, Oberon-0, arrays allow us to carve out pre-defined regions of memory of any arbitrary size to be used as we see fit. Because the original PL/0 language has no concept of arrays, we are free to define our own syntax for them.

    These are our challenges for today: choosing a syntax for arrays, implementing that syntax, and allowing array identifiers to be used just the same as the TOK_VAR identifiers we already have.

  • How to Use Frozenset Objects in Python

    This article will cover a guide on using the “frozenset” function in Python that returns a new frozenset type Python object. These objects are similar to set objects available in Python with some key differences. All code samples in this article are tested with Python 3.9.5 on Ubuntu 21.04.

  • How to Use the Tokenize Module in Python

    This article will cover a guide on using the “Tokenize” module in Python. The tokenize module can be used to segment or divide the text into small pieces in various ways. You can use these segments in Python applications that use machine learning, natural language processing, and artificial intelligence algorithms. All the code samples in this article are tested with Python 3.9.5 on Ubuntu 21.04.

  • How to Use Boolean Value in Bash

    The boolean value can contain two types of data. These are True or 1 and False or 0. Bash does not support Boolean values, but any bash variable can contain 0 or “true” and 1 or “false“. The logical boolean operators are supported by bash. The boolean value is required to use when the script needs to generate the output based on the True or False value of a variable. The way to declare and use boolean values in the bash script has shown in this tutorial.

  • PostgreSQL Union All Query

    This tutorial will show you how to use PostgreSQL Union and Union All queries to combine results from select statements.

  • PostgreSQL Limit Clause

    Let’s discuss the ins and outs of using the PostgreSQL LIMIT clause to limit the output to a specified value.

    Although the LIMIT clause is an optional statement, it is very handy when you do not want a query to return thousands and thousands of records.

  • PostgreSQL Grant Privileges

    In PostgreSQL, a user must have the LOGIN privilege to log into the database. However, explicit permissions must be assigned to perform database operations, including selecting tables, columns, and records.

    The PostgreSQL GRANT query allows you to modify privileges for users on database objects such as tables, columns, views, functions, schemas, and more.

    This tutorial will walk you through using the PostgreSQL GRANT command to modify privileges for various database objects.

  • PostgreSQL Functions

    PostgreSQL is a powerful and easy-to-use database management system that provides secure, fast, and very intuitive features, allowing you to focus on the data and not the query syntax.

    One way PostgreSQL makes its usage very easy is the functionality of pre-defined functions. These functions allow you to call them and pass the required arguments to get an output.

    In this post, we will give you a cheat sheet of the most common PostgreSQL functions and even show you how to define custom ones if needed.

  • PostgreSQL Count Function

    In most cases, when working with databases, our interest is the actual records stored in the database. However, an instance may occur where we need to determine the number of records in a specific column or entire table.

    To achieve this, we can define a custom function or use the built-in count function. In this guide, we will discuss the count function and various examples of how to use it.

  • MySQL IN Clause

    This tutorial will discuss using the MySQL IN query to check if a specific value is within a set of values, which is useful in replacing a set of OR operators.

»

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

More on Tux Machines: About ● Gallery ● Forum ● Blogs ● Search ● News ● RSS Feed

Part of Bytes Media ● Sister sites below.

TechBytes Techrights button

Powered by Drupal, an open source content management system

Content available under CC-BY-SA CC

© by original authors

Powered by CentOS 6.5 (GNU/Linux), Varnish, and Drupal 6