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  • How to fix: “You have mail” in macOS Terminal app

    October 25, 2019
    Arthur Gareginyan
    Mac OS
    Comments
    Updated: October 26, 2019
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    Recently I discovered the following; every new Terminal window that opened under macOS showing the mysterious notice You have mail.. In this tutorial, you’ll learn how to manage (read, delete, etc.) the mails from this notice.

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  • How to download a complete macOS Catalina installer app

    October 18, 2019
    Arthur Gareginyan
    Mac OS
    Comments
    Updated: October 20, 2019
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    Attempting to download macOS Catalina from the Mac App Store you may find that a small version of the “Install macOS Catalina.app” file downloads to the “Applications” folder, rather than the complete 8.1 GB installer file.

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  • How to uninstall a Ruby gems that are no longer needed

    October 17, 2019
    Arthur Gareginyan
    macOS
    Comments
    Updated: October 17, 2019
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    Every time we perform an update with gem update the default behaviour is to install a new version of a gem and continue maintaining the older version of that gem. Most likely, if you have been using Ruby for a while, your system will be full of gems, and more specifically, outdated gems. So how do we uninstall a Ruby gems that are no longer needed? In this tutorial, you’ll learn how to uninstall a Ruby gems.

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  • How to update Pi-hole to the latest version

    September 23, 2019
    Arthur Gareginyan
    Web
    Comments
    Updated: October 16, 2019
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    Pi-hole is a fantastic product for your home network that allows ad blocking at the network level. I thought that it is updated in the same way as all other parts of the system; using the sudo apt-get update and then sudo apt-get upgrade. But when I logged into my Pi-hole web interface yesterday, I saw a red message saying Pi-hole Version v4.3.1 (Update available!). So how do I update my Pi-hole? In this tutorial, you’ll learn how to update Pi-hole software to the latest version.

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  • How to add an app-ads.txt file to a website

    August 10, 2019
    Arthur Gareginyan
    Web
    Comments
    Updated: August 12, 2019
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    Google strongly recommend that we use an ads.txt and app-ads.txt files. This files can help protect our brand from counterfeit inventory that’s intentionally mislabelled as originating from a specific domain, app, or video. In this tutorial, you’ll learn how to create and add an app-ads.txt file to your website.

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My Cyber Universe was founded in May 2013 by Arthur Gareginyan, a designer and full stack software engineer. Main goal is to be the source for anyone who wants to learn the web design, software and web development.

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