This article shows how to perform a secure Linux server setup by creating a VPS, adding a sudo user, enabling public key access, activating the firewall, and disabling root access. Linux server Here we consider a few different VPS (Virtual Private Server) providers. Then, we choose a provider and see Read more…
Here is a quick introduction on how to create a Spring Boot web app. For this tutorial, I use Spring Tools 4 for Eclipse. Spring Boot Spring is a flexible framework with a lot of components that can be configured to be used by you Java applications. SpringBoot is a Read more…
This article shows how to quickly build a web application using the Spring Tools Suite. For this tutorial, I use Spring Tools 4 for Eclipse, where I initialize projects using Eclipse wizards. Spring Boot Web Application Spring has a lot of components, and SpringBoot is a convention over configuration approach Read more…
This article describes how to search for files in bash, and shows a few examples of using find, grep, and ag (the silver searcher). Search for files in bash People using bash on a daily basis know at least two basic tools for searching: find and grep. The main difference Read more…
To back up a WordPress website, you need to backup two components: database: posts, pages, categories, comments, users, plugin data, etc. filesystem: media, plugins, files, etc. Here we see how to backup and restore a WordPress instance via command line both in pure-bash fashion and also wordpress is running on Read more…
Permutations are for lists, order matters.Combinations are for groups, order does not matter. Better Explained Permutations A Permutation is an ordering of elements from a group of objects. Permutations of a set Say we have n elements and we want to arrange all of them with a specific order. To Read more…
Mergesort Mergesort is an efficient and widely used sorting algorithm. Stable sorting algorithm: preserves the order optimal time complexity: N log N in all cases suboptimal in space usage: usage of an extra array for merging Usage examples: Sorting Linked Lists when space is not a concern. Java default algorithm Read more…
This article contains a series of exercises on java arrays, including resizing array implementation, merging sorted arrays, etc.. Resizing-array implementation A Java ArrayList is a resizable-array implementation of the List interface providing amortized-time for insertion of O(1). Exercise: implement a ResizingArray class providing O(1) amortized-time for insertion. Growing the array Read more…
This article shows how to quickly build an EMF model using the Ecore Tools UML editor and generate the Java source code. For this article I am using eclipse eclipse-modeling-tools-2019-06. Modeling Motivations Main motivations for modeling and code generation: separation of application logic w.r.t. implementation: your independent model can be Read more…
In my development environment, I am running WordPress on docker containers, and I want a system to backup (and restore) both the DB and the WordPress data. For this article, I assume you are familiar with docker and Linux bash concepts. If you just want to backup a DB running Read more…