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today's howtos

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HowTos
  • CSS: Avoid horizontal scrolling

    If you had told me last year that I’d write not one, but two blog posts about web design, I would not have believed you. Alas here we are, and I’m going to tell you about another pet peeve of mine and how to fix it.

    I view at least half the written content I consume via my mobile phone, which belongs to the class of phones with a slightly smaller than average screen. In fact, it’s width as reported by the Firefox and Chrome viewport simulators is 375 pixels wide, small but not tiny. And yet many websites I visit hinder my mobile viewing experience because of a rather simple issue: horizontal scrolling.

    There I am, happily reading a blog post or article from the front page of $NEWSAGGREGATOR. But suddenly I’m not scrolling down, but down-right and constantly have to scroll back to the left edge in order to read full sentences. My experience is even worse if the site for some reason has a minimum width larger than my screen is wide.

    Reading articles on those sites really cumbersome and more often than not I decide that it’s not worth the hassle to continue reading and move on to the next article. I find that quite sad, since the author invested time and effort to produce it, and the only reason I’m not reading is because of its subpar layouting.

  • Configure Postfix as a Send-Only SMTP Server on Ubuntu 20.04

    Postfix is an open-source Mail Transport Agent (MTA). An MTA is a component of the Simple Mail Transfer Protocol (SMTP) responsible for transferring mail from one mail server to another.

    This tutorial describes how you can install and configure Postfix as a send-only SMTP server on Ubuntu 20.04. You can use this for sending notification emails to an external address when specific events occur on the server -- such as when a backup job succeeds or fails.

  • Get a list of all virtual hosts which are defined in all apache configuration files

    Have you ever looked in the apache config files to see where a website's virtual host is defined? The apache2ctl script has a useful option that could come in good here.

  • Command line quick tips: wc, sort, sed and tr - Fedora Magazine

    Linux distributions are great to use and they have some tricks under their sleeves which users may not be aware of. Let’s have a look at some command line utilities which really come in handy when you’re the guy that likes to stick with the terminal rather than using a GUI.

    We all know that using a terminal is more efficient to use the system. In case you are editing or playing with text files on a terminal then these tools will surely make your life easy.

    For this article let’s have a look at wc, sort, tr, and sed commands.

  • How to recover deleted Logical volume (LV) in LVM

    If you have accidentally removed a logical volume (LV) or LVM meta data got corrupted or damaged in some way, it can be easily restored without losing the data using the ‘vgcfgrestore’ command.

    In this guide, we’ll show you how to restore accidentally deleted a logical volume in Linux.

    By default, LVM automatically takes backup of it’s meta data whenever a configuration change occurs on all LVM devices using the ‘vgcfgbackup’ command.

  • How to use cron on Linux | Opensource.com

    The cron system is a method to automatically run commands on a schedule. A scheduled job is called a cronjob, and it’s created in a file called a crontab. It’s the easiest and oldest way for a computer user to automate their computer.

  • OpenSSH ssh-agent Shielded Private Key Extraction (x86_64 Linux)

    While most of you guys were furiously grep-ing TermService memory for clear-text passwords I found myself searching for plain-text private keys in a ssh-agent process memory on a Linux box. Last time I did something similar was definitely before June 2019, when Shielded Private Keys were introduced in OpenSSH, therefore the tools I have available don’t work anymore.

More in Tux Machines

C/C++ Programming/Development

  • How to pass a struct to a function in C

    A structure has been widely used as a user-defined data type in the C language. The purpose of using structures in C is to create a single data type that would be used further to group various data type variables or elements into one type. The structure has been used as a global variable so all the functions can access it easily. This means it can’t be declared in the main method so that we can use it anywhere.

  • C++ String Reverse

    If the string, “vwxyz“, is reproduced in the new order as, “zyxwv“. Then the string has been reversed. Unfortunately, such direct reversibility is not possible in C++. However, there is a classical workaround for reversing a string in C++. Keep reading this article to know-how. A string can be created in two main ways in C++. A string can be created as a constant pointer to a sequence of characters. A string can also be created by instantiating a string object from the string class. This article deals with string objects instantiated from the string class. This means the string library has to be included in order to execute the code samples in this article. A string object is a data structure where the string literal is a list. Each character is of one element in the list. And so, a literal string can be handled like an array of elements. This article explains the classical workaround to reverse a string in C++. This essentially iterates the string literal, backward. Having a summary knowledge of forward iteration enables the reader to understand reverse iteration better. This article deals with string objects instantiated from the string class.

  • C++ String starts with

    There comes a time when the programmer has to know what a string starts with. This knowledge can be used to choose or eliminate items in a list of characters. So, a programmer may want to know if a string starts with a particular character or with a particular sub-string. A programmer can write code that will check the initial characters of a string, one-by-one, and compare that with a prefix sub-string. However, all the strategies involved have already been done by the C++ string library. The C++ string class of the string library has the member function, starts_with(). This does the work for the programmer, but the programmer needs to know how to use the function. And that is why this tutorial is being produced. There are three variants of the string starts_with() member function. Variants of the same function are called overloaded functions. The basic approach for the start_with() member function is to compare a short independent sub-string with the first short segment of the string in question. If they are the same, then the function returns true. If they are different, the function returns false.

  • Function Overloading in C

    Function overloading is a very well-known concept used in object-oriented languages having many functions with the same name and different parameters in a single code. The object-oriented programming languages which support function overloading include Java and C++. As the C compiler doesn’t allow it to be used in the code hence, it isn’t easy to implement function overloading in C. Yet; we can still achieve the same thing with some technique. Let’s start this article with the opening of the shell terminal of Ubuntu 20.04 LTS.

PineTime Smartwatch and Good Code Play Bad Apple

PineTime is the open smartwatch from our friends at Pine64. [TT-392] wanted to prove the hardware can play a full-motion music video, and they are correct, to a point. When you watch the video below, you should notice the monochromatic animation maintaining a healthy framerate, and there lies all the hard work. Without any modifications, video would top out at approximately eight frames per second. To convert an MP4, you need to break it down into images, which will strip out the sound. Next, you load them into the Linux-only video processor, which looks for clusters of pixels that need changing and ignores the static ones. Relevant pixel selection takes some of the load off the data running to the display and boosts the fps since you don’t waste time reminding it that a block of black pixels should stay the way they are. Lastly, the process will compress everything to fit it into the watch’s onboard memory. Even though it is a few minutes of black and white pictures, compiling can take a couple of hours. Read more

today's howtos

  • How to play Dungeon Defenders on Linux

    Dungeon Defenders is a hybrid multiplayer video game developed by Trendy Entertainment. The game was released on Microsoft Windows, Xbox, iOS, Mac OS, Linux, etc. Here’s how to play the game on Linux.

  • How to play Company of Heroes on Linux

    Company of Heroes is a real-time strategy game developed by Relic Entertainment. The game takes place during WWII and was released on Windows, OS X, iOS, Android, and Linux. Here’s how you can play Company of Heroes on your Linux PC.

  • How to Install TeamViewer on Ubuntu Linux

    TeamViewer is a popular cross-platform tool that allows a user to remotely access and control another user’s computer in an easy and secure way. File sharing, remote desktop control and web conferencing between computers are all possible using TeamViewer. TeamViewer is useful for providing remote customer support in organizations, collaborating with colleagues who are far away, and connecting to your own device remotely. This article will walk you through the process of installing TeamViewer on Ubuntu systems.

  • How to Upgrade Ubuntu 21.04 to 21.10 Impish Indri

    Ubuntu has officially released the Ubuntu 21.10 codenamed Impish Indri. This has seen the introduction of GNOME 40 as the default desktop, and sadly GNOME 41 did not make the final cut. The release also introduces Linux Kernel 5.13 among new applications and other back-end performance improvements.

  • How to Extract Tar Bz2 File in Linux - ByteXD

    In this tutorial, we will be showing you how to use tar command to extract tar.bz2 files. Tar stands for tape archive, and it is one of the most used commands that deals with compressed archive files. Bz2 stands for bzip2. It is a specific compression algorithm. The tar command comes pre-installed in most Linux distributions. The tar utility is used to compress and extract files using different algorithms. Tar supports a wide array of compression algorithms such as gzip, bzip2, xz, lzip, etc.

  • How to mount ISO in Kubuntu Linux - Darryl Dias

    Dolphin file manager in Kubuntu (Tested this in Kubuntu 21.04) does not ship with Mount ISO option in the right click menu, but with the help of the dolphin-plugins package we can add this and many other features.

  • Setup OpenWRT on BPi-R2 | Zamir's Board

    It’s pretty easy to get OpenWRT start and running on BPi-R2. However, I realized that I need to extend the root filesystem to the whole disk, which is where the struggling starts.

GNOME Gingerblue 2.0.0 Recording Software supports XSPF 1.0

GNOME Gingerblue 2.0.0 is Free Recording Software for GNOME. In the 2.0.0 release I have added support for XSPF 1.0 from Xiph.org. Read more Also: Free Software Review: Balena Etcher couldn’t be easier for writing ISO images, but do they really need telemetry? – BaronHK's Rants