Rename an Amazon Lightsail instance

Amazon Lightsail is a perfect solution for a newbies to cloud computing like me. It offers a very simplified interface and overall approach into creation and management of fully featured VPSes (Virtual Private Servers) without the overhead and hassle of using more complex and more professional solutions like Amazon EC2.

The most important part of its greatness, next to simplicity, is pricing. The smallest possible option (just a virtual server with:

  • 512 MB memory and 1 core processor
  • 20 GB SSD disk and 1 TB of outbound traffic per month

which is far enough to host a simple-to-middle WordPress site will cost you 3.5 USD per month only. One static IP (with the possibility of using your own domain thus) is added free of charge.

You will be billed more only if your site has enough interest to go beyond that 1 TB outgoing traffic or if you decide that you need more computing power. Other than that — just a plain three and a half buck per month.

However, there’s a little glitch when you create your instance with an incorrect or misleading name, because the process of renaming Amazon Lightsail instance includes a few steps and some downtime on your website.

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Fix incorrect mp3 duration with mp3val

I’ve found a few files for which:

  • Video LAN for Windows was playing them without any problems (after a 1 second glitch),
  • Winamp for Windows was playing them also without problems, but showing 00:00 as each file’s duration
  • mobile player for Android failed to play them showing Cannot play content error.

A quick look-around the Internet showed that a tiny mp3val program can validate any .mp3 file and fix most errors, it finds.

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Batch remove silence from many MP3 files

I’ve downloaded over fifty one hour long recordings of my church-related celebrations. As with most of such recordings, every file contains about 5-6 minutes of:

  • silence or
  • non-related sounds

in the beginning during priest’s processing, people gathering etc. Plus it concludes some silence during various moments of celebrations. I wanted to get rid of it.

I found this eleven years old question at Super User. It’s not only very old, but also off-topic (no software recommendation-like questions allowed at SU) so I decided to put my own update here.

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Print two A5 pages on singe A4 paper sheet

Suppose you have a Microsoft Word document that is formatted to be printed on A5 pages. For any reason (you don’t have A5 page, you want to save paper etc.) you want to print it so that two A5 pages will appear next to each other on single A4 page.

On contrary to common beliefs this is not as easy as selecting 2 Pages Per Sheet because, without additional settings, your printer will be still asking you to feed it with A5 paper.

It’s not that easy, but the solution is still surprisingly simple.

This article is specific to (ISO 216 standard) paper size standard and for printing two A5 pages on one A4 sheet. But the very same steps should theoretically work in every scenario where you want to print two half-sized pages on single page format that is twice as big. Thus, printing (plotting?) two B3 pages on one huge B2 poster should work. Or printing two Letter-sized pages (216 × 279 mm) on one Ledger page (432 × 279 mm).

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Reverse dates in filenames using Total Commander’s multi-rename tool

Multi-rename tool in Total Commander is fantastic (when you know how to use it) and it saved my ass (before manually renaming many files) in many scenarios, including some very specific or even weird ones.

This scenario is one of such.

I had dates written directly as a part of filename, i.e.: Document name (DD-MM-YYYY).jpg, but (as shown) starting with day and ending with year. I had to reverse them, but only dates, keeping the rest of file untouched — i.e. Document name (YYYY-MM-DD).jpg.

At first, I thought that this time I will be forced to do this manually. But, I recalled multi-rename tool’s documentation and its small part about backward characters counting (i.e. from end of filename).

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A very quick introduction to QEMU

If you’re developing your own applications for Raspberry Pi:

There’s a never-ending question on testing your results.

Copying:

  • New version of your app into Linux on your RPi and running it or
  • New disk image to microSD and booting entire device

Doesn’t seems to be a huge problem.

But, when you have to do this dozens of times each day than an emulator-like questions appears.

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Get some base Linux info in QNAP TS-210 using console

QNAPs runs on (sometimes heavily modified) Debian distributions. But, what about kernel version etc.?

There several ways of getting this information from console. Out of them following works on TS-210:

  • uname -a
  • cat /etc/issue
  • cat /proc/version

If you ever need more information on this then… LMGIFY.

In this article I’ll show you the very basic commands that can be used on QNAP TS-210 (modified Debian Linux) to obtain system release, version, hardware info etc.

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Border-less full-screen console app in Ultibo

I made my first project in Ultibo and compiled some example one. Everything was just fine (actually — perfect), if not for that green border with Ultibo name and release version.

Don’t get me wrong. I already love UItibo and will spread the word. But, for security reasons, I’d like to get rid of any info that clearly communicates what was used to build particular piece of software.

Fortunately, with a small research (here and here), it turned out that the solution is very easy.

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Error code 6009 when deleting folder from OneDrive

If you’re getting “Error Code 6009” during attempting to delete any folder from OneDrive:

Then look carefully for all open browser windows and tabs. Because this error means that you are trying to delete a folder which contains any file that is already opened in some window or tab.

If you cannot find any tab or windows of such kind then restart browser and try to delete folder again (alternatively, restart the whole computer). As there maybe some background task, not visible to you, that is holding a file lock and preventing you from deleting a parent folder.