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Programming Leftovers

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  • How to Use std::array

    The std::array notation in C++ is an alternate method of declaring and initializing the arrays in C++. However, a question might arise in your mind that when we can declare and initialize the arrays already, then why do we even need this notation in the first place? In this article, we will try to explore the answer to this question. After that, we will share some examples with you to demonstrate the usage of the std::array notation in C++ in Ubuntu 20.04.

    The std::array Notation in C++:

    We have already stated that the std::array notation in C++ is an alternate method of declaring and initializing the arrays. However, we still need to figure out the need to use this notation. Generally, there are two types of arrays in C++, i.e., static and dynamic. Both these types of arrays have their pros and cons. The static arrays lose all the information regarding their size once they are passed to a function as a pointer, whereas the dynamic arrays’ deallocation is very problematic.

    Therefore, the std::array notation is used to make the best usage of both of these types, i.e., using this particular notation, a static array never loses the information that it contains even when it is passed to a function. This is exactly why we use this notation in C++. You will learn more about the usage of this notation in C++ by going through the next section of this article.

  • I finally start to translate Japanese Perl Zemi to English. | Yuki Kimoto Perl Blog [blogs.perl.org]

    I finally started to translate Japanese Perl Zemi to English.

    Perl Zemi | Perl Zemi|Perl Installation, Perl Tutorial, Many Examples

    Perl Zemi is Japanese Perl Tutorial site which is well known and red in Japan. Most of all Japanese Perl users know Perl Zemi and read the document repeatedly.

  • PHP file_get_contents() Function

    PHP contains many built-in functions to read the content of any existing non-empty file. The file_get_contents() is one of the built-in functions of PHP to read the entire content of an existing file as a string. The syntax of this function is given below.

  • PHP in_array() Function

    Array variables are used to store multiple values where each value is accessed by using the index value. Sometimes we need to search a particular element in an array for programming purposes. The in_array() is a built-in function of PHP to search specific elements into an array. It searches data in a case-sensitive manner. The way to use this function for searching value in an array has been described in this tutorial.

  • PHP json_encode() Function

    The JSON is a popular data format that is used to serialize and transmit structured data between the web server and application because the JSON file is human-readable and lightweight. The json_encode() is a built-in function of PHP that converts the array or object into JSON data for various purposes. The various uses of this function have shown in this tutorial.

  • PHP password_verify() Function

    The password_verify() function is used to match the hash password with the original password. Another function, password_hash() is used to generate the hash value based on the hashing algorithm, cost, and salt value. The password_verify() function contains all hashing information to verify the hash with the password. The uses of this function have been shown in this tutorial by using multiple examples.

  • PHP require_once() Function

    When a PHP script is used in multiple files for programming purposes, then it is better to write the script in one file and include the file in those files without writing where the script is required. PHP has many built-in functions to include any existing file in a script. These are require(), require_once(), include(), and include_once().

    The task of require() and require_once() are the same, but the one difference is that the require() function does not check the file has been included before or not but the require_once() function check the file has been included before or not. If the file has been included in the script before, then the require_once() function will not include the same file again. How the require_once() function is used to include files in PHP has been shown in this tutorial.

  • PHP unset() Function

    The unset() function is used to reset any variable that has been defined earlier. Two types of variables are used in any programming language. One is a global variable and another is a local variable. The variable defined outside the function is called a global variable that is accessible from anywhere in the script. The variable defined inside the function is called a local variable that is accessible inside the function only.

    If the unset function is used for the local and global variables, then it resets both variables locally. That means the value of the global variable remains unchanged that was defined before changing inside the function. The $GLOBALS array or global keyword can be used to unset the global variable permanently. The uses of this function to reset PHP variables have shown in this tutorial.

  • PHP var_dump() Function

    The var_dump() function is a built-in function of PHP to find out the information about the value and data type of one or more variables. It also provides information about the length of the data for the string variable. The information about both scalar and compound variables can be retrieved by using this function. Different uses of this function have been shown in this tutorial.

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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.