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Programming Leftovers

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  • How static linking works on Linux |

    Code for applications written using C usually has multiple source files, but ultimately you will need to compile them into a single executable.

    You can do this in two ways: by creating a static library or a dynamic library (also called a shared library). These two types of libraries vary in terms of how they are created and linked. Your choice of which to use depends on your use case.

    In a previous article, I demonstrated how to create a dynamically linked executable, which is the more commonly used method. In this article, I explain how to create a statically linked executable.

  • Dart Conditionals

    Decision-making expressions are those which let programmers choose which statement to execute under different circumstances. Conditional statements are used in different programming languages to inform the computer on what factors to make when certain conditions are met. These decisions are taken only if the already stated conditions are true or false: it depends on the functions in the mind of the programmer. The if statement, if-else statement, and if-else-if statements are often used in Dart to introduce the conditional implementation of statements based on one or more Boolean expressions.

    The syntax within the example of the Dart If statement, If-Else statement, If-Else-If ladder, and nested If-Else statement will be covered in this tutorial.

  • Dart Interfaces

    An interface in the Dart programming language is considered as a way of creating abstraction within your code. The Dart interface acts as a blueprint for all the classes that wish to implement this interface. Afterwards, these classes are required to provide their own implementations for all the interface methods. In this article, we will teach you the use of the interfaces in the Dart programming language in Ubuntu 20.04.

  • Dart Sets

    A set in the Dart programming language is defined as a collection of multiple elements of the same data type. However, each of these elements needs to be unique. In this guide, we will study the usage of the Dart sets in Ubuntu 20.04 by going through some simple yet helpful examples.

  • Dynamic Memory Allocation in C

    In DMA, the decision on memories that are allocated cannot take during the compile time. This decision or memory is allocated during the Runtime.

    Whenever we create any variable through DMA, that type of variables do not have any name; we access these variables through address or pointer.

    In SMA, Programmer knows from earlier time that how many Variables or How many memories are required for his/her program.

    But In DMA, programmer does not know from earlier state that how many variables or memory is required, it depends upon the user’s requirement.

  • Arithmetic Operator in C

    There are several types of operators are present in C languages. With these operators, we can manipulate different types of operands or data with different procedure. Arithmetic operator is one of the operators by which we can operate different types of mathematical values. First, we have to see that what the position of arithmetic operator in operator groups is.

  • VR with Qt Quick 3D—source code now available

    Some of that work is already part of Qt: Qt Quick 3D Physics will be released as Tech Preview in Qt 6.4. The VR part is not currently on the roadmap, however, so we haven't got to the stage where we polish the module to Qt levels of quality. But it is still a lot of fun to play around with, and it is amazing to be able to experience a Qt Quick 3D scene in VR by just adding a couple of lines of code.

  • User override of top-level zram

    This means that as you use the applications, download packages, etc., it will all be happening in zram, with no writes to the drive. Instead, there is a "save" icon on the desktop, and save is offered at shutdown, when or if you want to save the work to the drive.

    This is great for a flash drive, where you likely want to limit writes to the drive; however, if Easy is installed to a HDD or a high-quality SSD, it will not be such a concern. In that case, you might prefer the previous behaviour with direct writes to the drive, and no "save" icon on the desktop.

    I know that some people prefer to have a "save" icon anyway, as a security measure. That is, if something happens that you don't like, just shutdown without saving.

    Anyway, there is now a mechanism for users to override the default setting for top-level-zram...

  • Numpy Np.Apply_Along_Axis

    The apply_along_axis() function is used to apply a specific function to a 1D slice along a specified axis.

  • Numpy Np.Add.At

    The a function in NumPy allows you to perform an in-place operation on the left-side operand.

    In the case of an addition operation, the function will add the right operand to the left operand at the specified array index.

  • Numpy Fromfile

    This article will discuss saving and reading a NumPy array to and from a binary file.

  • NumPy Count True

    We have an array containing Boolean elements. The goal is to determine how many of those elements in the array are True.

  • Find Strings in Pandas

    This article will help you understand various methods we can use to search for a string in a Pandas DataFrame.

  • Pandas Combine Date and Time

    This short article will discuss how you can create a Pandas timestamp object by combining date and time strings.

  • Enlarging the Perlosphere

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.