Over the course of a long-lasting project, your author information may change and the associations to a user profile on GitHub or GitLab may become broken. This is the ultimate guide for how to change the entire commit history. — You should only do this in repositories that are not widely used yet. The changes are rather intrusive, but easily manageable in a one-person project or within a small team. In any other case, use it when all team members are coordinating this together.

If you need to check a few VAT numbers the VIES website is a good place to go, but validating more gets time-consuming. This guide explores a bulk VAT verification service for VAT numbers. — There are a few bulk VAT number verification services out there that can perform the task for you. One that I’ve come across recently is an Excel-based macro that will obtain results from VIES. Since I’m personally a fan of cloud-based services I wanted to look beyond what the first…

Accounting for EU VAT could be one of the most challenging hurdles to new software companies that want to implement compliant online payments for their digital products and subscriptions. This tutorial has an easy solution. — You’ve probably heard of it and maybe you already had to answer to a customer who demanded a VAT invoice. It’s EU VAT, the headache that started in 2015 with VAT MOSS and continues to wreak havoc to non-compliant startups, even outside the European Union.

Business customers enjoy special tax treatment because they are not charged a VAT in the EU. This tutorial attempts to automate VAT number re-validations for your subscription business. — If you run an online subscription business, you’ll ultimately end up signing up customers from the European Union. Tax Treatment for Business Customers A business customer does not need to pay VAT. …

Sending and receiving emails with a custom domain name generally implied subscribing to a full-fledged email provider such as Google’s G Suite or Microsoft’s Office 365. This tutorial shows how you can send and receive emails using Gmail for free. — Many domain name registrars offer free email forwarding to every domain name you register with them. I’m using Namecheap which does exactly that. While I cannot discuss the setup procedure for every single registrar out there, I hope to lay it out to you by showing Namecheap as an example…

Are you frustrated that cloning your Git repository over SSH always results in a “permission denied” error message in the terminal? Here’s how to fix it once and for all. — I operate several droplets on DigitalOcean and this issue has been bugging me for ages. When I couldn’t take it anymore, I spent a whole hour searching for and trying out various suggested fixes with absolutely no avail. …

After you’ve installed MongoDB, you will want to create separate users for each database to avoid vulnerabilities if any of the users gets compromised. This MongoDB tutorial shows how. — If you haven’t installed MongoDB on your server yet, please follow my MongoDB installation guide here. I personally run MongoDB on a DigitalOcean droplet which was really easy to install. If you like, you can give it a try with a $100 credit by simply following this link:

Whenever you log into your server, you’ll notice a command language interface (CLI) prompt starting with user@hostname. This tutorial shows you how to change that hostname. — This tutorial was originally published on Gatemill: How to Change the Hostname on Ubuntu Whenever you log into your server, you'll notice a command language interface (CLI) prompt starting with user@hostname…gatemill.com Type the following command to change the hostname with immediate effect: