Tutorials Index Page 15


How to directly initialize a HashMap (in a literal way)?

How to initialize a Java HashMap with curly brackets notation. Learn here some alternatives.


Oracle SQL: How to write a que for filterting Date columns

Oracle SQL date format can be tricky to understand and could make you loose time to figure out why a query is not working. We use TRUNCATE and TO_DATE function to create a query to filter by a date on a timestamp column.


How to upgrade LEDE Linux using opkg (or trying to do opkg upgrade)


How to convert virtual box disk to KVM qcow

With a few linux commands convert any virtual box disk or virtual machine for use with KVM virtualization.


How to setup Flask with gunicorn and nginx with example

Follow this steps to configure flask application with gunicorn wsgi using nginx. We also extend the tutorial for load balance flask application using nginx. We will explain everything from installation to boot scripts for gunicorn.


Install nginx from source code

Here we explaint he most easy way to convert virtual box virtual machines to kvm.


Installing Python 3.6.2 on raspberry pi (raspbian)

This guide explain with steps how to install python 3.6.2 on raspberrypi


Enable additional SPI port on the raspberry pi 2

How to enable a second hardware SPI port on the raspberry pi. SPI1 pinouts on the raspberry pi.


Install neovim on Debian jessie o vivid using packages or

Simple steps to install neovim using apt-get for ubuntu, debian jessie


How to use HTML5 input type color in Form Component

HTML input element supports the attribute called color which will popup a color picker. The picked color will be store in the value attribute of the input. Read the article for full details