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Programming Leftovers

Submitted by Roy Schestowitz on Friday 4th of June 2021 06:20:54 PM Filed under
Development

  • Remi Collet: PHP version 7.4.20 and 8.0.7

    RPMs of PHP version 8.0.7 are available in remi-php80 repository for Fedora 32-34 and Enterprise Linux (RHEL, CentOS).

    RPMs of PHP version 7.4.20 are available in remi repository for Fedora 32-34 and remi-php74 repository Enterprise Linux (RHEL, CentOS).

  • C Data Types – Linux Hint

    Linear programming is a mathematical model which is generally used in data science for optimization. The optimization means we can understand the meaning like maximum profit and less cost. The company or the organization has mainly two main objectives, minimization, and maximization. The minimization means to cut the extra cost which comes in productions to get the maximize profits. Linear Programming is discussed in this article.

  • Linear Programming – Linux Hint

    Sometimes we need optimization in real life too to get the maximum profit. So, optimization techniques belong to deep learning, where we try to achieve the minimum loss. But sometimes, we have limited resources and want to get the maximum profit; then linear programming comes in.

    Linear programming is a mathematical model which is generally used in data science for optimization. The optimization means we can understand the meaning like maximum profit and less cost. The company or the organization has mainly two main objectives, minimization, and maximization. The minimization means to cut the extra cost which comes in productions to get the maximize profits. Linear programming is a simple optimization technique that can help in the same way. Linear programming is everywhere around us; for example, when we work on any project, we also make strategies to manage the teamwork to fast-delivery efficiently.

  • Operator Precedence in C – Linux Hint

    Operator precedence in C or any other programming language is defined as the order of priority according to which different operators are executed within arithmetic or logical expression. Whenever we intend to make a decision in a C program or perform a calculation, the operators and their associated expressions are used very extensively.

    In this guide, we will educate you on the precedence of these operators in the C programming language in Linux by demonstrating some relevant examples.

  • Typedef in C – Linux Hint

    Every programming language is equipped with certain built-in keywords that account for the strength and abilities of that programming language. Similarly, the C programming language also has some very interesting keywords that serve exceptionally amazing purposes. One such keyword in the C programming language is the “typedef” keyword. As the name of this keyword implies, it is generally used to define the type of any following entity.However, this type is not like the regular types rather it acts as an alias of the following entity. You can consider it as a short name for the entity following this keyword. The usage of this keyword increases the readability of your code since you tend to avoid lengthy and complex names and hence it decreases the complexity of your code. We will try to throw some more light on the usage of this keyword in Linux in the proceeding sections of this article.

  • Typecasting in C – Linux Hint

    Typecasting is the process of converting an attribute from one type of data to a new one. While it creates perfect sense, the compiler can transform one kind of data into something else. In case we add an integer data type value to a floating-point mutable keyword, the compiler converts it to a “float” value. Casting permits us to create this type of transformation transparent or compel this when it would not otherwise occur. Two types of Casting that have been used in the C language. We will discuss both of the typecasting kinds in our guide.

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  • Language Zealots Are The Bane Of Development

    Every programmer has a favourite language but there's a difference between having a favourite and being attempting to force your language on other people without any productive reason.

  • Creating a library of functions in Linux shell script - Linux Concept

    If we want to create our own library of functions, then we can create a script and add all the functions into this script. We can make all the functions from our script functions.sh available in the current shell by calling source or the period . command.

  • Running functions in the background in Linux bash script

    We have already seen in previous chapters that to run any command in the background, we have to terminate the command using &:

  • Understanding functions in Linux bash script - Linux Concept

    We human beings, in our day-to-day lives, are helped by people who have certain knowledge or skills, such as doctors, lawyers, and barbers. This helps our lives to be more organized and comfortable so that we need not learn every skill in this world. We take advantage of skills that have already been acquired by other people. The same thing applies to software development as well. If we use code or scripts that have already been developed, this will save our time and energy.

    In real-world scripts, we break down big tasks or scripts into smaller logical tasks. This modularization of scripts helps in the better development and understanding of code. Functions can be called the smaller logical blocks inside the shell script.

  • How to Schedule Tasks on Ubuntu 20.04 Using Crontab

    Sometimes you don’t want a process to run at a default time set by the operating system, but you want to set the time for a process to run yourself. To do this, we use the cron daemon in Ubuntu, which works in the same way as the task scheduler in Windows. With the cron daemon, you can specify the time at which a process, such as a maintenance or a backup job, should be executed. This way, you can automate these tasks to run later without manual intervention. This article explains how you can do this with Crontab in Ubuntu.

  • Understanding signals and traps for Linux shell script

    Two types of interrupts exist in the Linux operating system: hardware interrupts and software interrupts. Software interrupts are called signals or traps. Software interrupts are used for inter-process synchronizations.

    Signals are used to notify us about a certain event occurrence or to initiate a certain activity.

    We use software signals many times. For example, if any command does not respond after being typed, then you might have entered Ctrl + C. This sends a SIGINT signal to the process, and the process is terminated. In certain situations, we may want the program to perform a certain activity instead of terminating it using Ctrl + C. In such cases, we can use the trap command to ignore a signal or to associate our desired function with that signal.

  • Using the trap command in Linux bash script - Linux Concept

    If a signal or software interrupt is generated while the script is running, then we can define what action is performed by that interrupt handler using the trap command. The trap command helps us in re-assigning the system response to a particular signal through the user-defined function or commands.

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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.

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