Useful Linux commands
Note: All commands must be prefixed with “sudo” in case your user account doesn’t have enough privileges. System $ uname -a Displays Linux system information […]
Continue reading »Latest Posts
Setting up a DNS-server on Ubuntu 16.04
ref: https://tecadmin.net/configure-dns-server-on-ubuntu-linuxmint/ BIND9 If you have a “normally complex” network at home, You usually have an internet router which takes care of DNS-resolutions. However the downside […]
Continue reading »
Java 11 is here!
In accordance with the new policy of releasing a new Java version every 6 months, we now have a fresh installation of Java 11 to […]
Continue reading »
Installing node.js on Ubuntu (16.04 specifically)
how-to-install-node-js-on-ubuntu-16-04 has a great explanation, but long, about the details. The short version come here: Do NOT use the ubuntu package version. It´s old and named […]
Continue reading »Can´t get Gigabit connection?
Do you get 100Mbps link speed when you expected Gigabit? In my experience, it´s always the cable to blame, 9 times out of ten. The […]
Continue reading »
Don’t like Java? Create your own language!
Nowadays, it’s easier than ever to create your own computer language. Whether it’s a simple rule-system, or a full-blown language, you can create the tokenizer […]
Continue reading »
Using microservices when building large-scale systems
Microservices, when supported by a robust framework, is a incredibly productive way of building large-scale services. You get a lot of support from the framework, […]
Continue reading »Video editing! In Linux !! from the Terminal !!!!
I love this blog post from Daniel Clark, who normally writes little nuggets about Ruby on Rails. But here he describes how to edit video […]
Continue reading »Some great WordPress-tips
https://www.facebook.com/groups/wpsvse/permalink/10156211401199699/ https://www.facebook.com/groups/wpsvse/permalink/10156215396494699/
Continue reading »Sending mail from Ubuntu 16.04
This worked for me: https://askubuntu.com/questions/522431/how-to-send-an-email-using-command-line With CERT fixes from here: https://stackoverflow.com/questions/39341137/postfix-must-issue-a-starttls-command-first
Continue reading »Setting up multiple WordPress sites
This is a good overview, but with some syntactical mistakes: https://hostpresto.com/community/tutorials/how-to-deploy-multiple-wordpress-sites-on-a-single-ubuntu-16-04-host/ Whats strange is that my installation on CAESAR gives error ERROR 1698 (28000): Access […]
Continue reading »Setting up a root user in MySQL/MariaDB
CREATE USER ‘admin’@’%’ IDENTIFIED BY ‘mysecretpassword’; GRANT ALL PRIVILEGES ON *.* TO ‘admin’@’%’ WITH GRANT OPTION; FLUSH PRIVILEGES;
Continue reading »Installing Oracle Java 9 on OSX/macOS
For macOS/OSX all you need to do is download and run the DMG from http://www.oracle.com/technetwork/java/javase/downloads/jdk9-downloads-3848520.html
Continue reading »Creating a Ubuntu/Linux user
sudo adduser alpha Answer all quesions, I isually hit Enter on all except Full Name If you want to make this a sudo-able user, add […]
Continue reading »Saving GIT passwords
Saving your git password lets you skip giving username/password at every checkin Normally you use git config –global credential.helper store but this is not very […]
Continue reading »Setting up MYSQL, Apache2 and WordPress
MySQL/MariaDB Remember to change bind-address to 0.0.0.0. By default it is set to 127.0.0.1 and then you can’t connect remotely! Exactly which config file it […]
Continue reading »SSH Login without password
http://www.linuxproblem.org/art_9.html Basically you add the content of your own ~/.ssh/id_rsa.pub to the targets ~/.ssh/authorized_keys file. (Replace ‘a’ with your username, A with your hostname or […]
Continue reading »Setting up Oracle Java 9 on Ubuntu
Since Oracles own instructions (https://docs.oracle.com/javase/9/install/installation-jdk-and-jre-linux-platforms.htm) sucks big time, I can recommend this one instead: https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04 Simple and easy to follow. And it WORKS!
Continue reading »Setting up Samba on Ubuntu
First of all, check the documentation: https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Standalone_Server then go ahead: sudo apt-get install samba decide which LINUX user should be used (or create a new). […]
Continue reading »Javascript frameworks 2018
Some alternatives to Angular 1.x (deprecated), Angular 2 (Typescript) and Angular v4 https://www.slant.co/topics/4306/~angular-js-alternatives vue.js riot react (not a framework, per se. It’s a view rendering […]
Continue reading »What you need to know about AWK
General structure BEGIN { print “BEGIN” } /filter1/ { print $0 } /$6 == “Nov”/ { print $1, $2 } […]
Continue reading »
Why Ruby is Great!
The single reason why I started dating Ruby class VCR def initialize @messages = [] end def method_missing(method, *args, &block) @messages << [method, args, block] […]
Continue reading »Fancy Pancy Tech Talk
You can find a lot of business terms here https://en.wikipedia.org/wiki/List_of_business_terms https://en.wikipedia.org/wiki/List_of_buzzwords Churn Rate Churn rate, when applied to a customer base, refers to the proportion […]
Continue reading »Rails relations
problem You know when you want to select records depending on the values of related records (like belongs_to fields) ? scenario class TradingSignal < ActiveRecord::Base […]
Continue reading »Rails HATM (Has and belongs to many)
Nested forms with HABTM and HasManyThrough Start with the models has_many :events # creates …… accepts_nested_attributes_for :events, :allow_destroy => true # creates…. attr_accessible :events_attributes # […]
Continue reading »Running a script “later”
You know how it is, you need to download a 3GB install kit, but don’t want to disturb the missuz by clogging all the bandwidth. […]
Continue reading »Hitta exponentialfunktion från två punkter
Exempel 1 : Hitta den exponentialfunktion som går genom punkterna (1, 2) och (3, 5) Hitta basen a som kvoten mellan y2 och y1 a […]
Continue reading »Docker – dealing with images
I keep this blog item handy: Docker – Clean Up After Yourself! It talks about how to maintain and clean up the “leftovers” from running […]
Continue reading »Developing Rails apps using Docker
This article assumes that you have docker, docker-compose and docker-machine installed. For OSX use Docker Toolbox at docker.com/toolbox. For Linux install docker and docker-compose using […]
Continue reading »Swedish VPS providers
Huvudsakligen från https://sulo.se/2011/02/24/svenska-vps-leverantorer-en-prisjamforelse/ https://www.fsdata.se/server/vps http://www.glesys.se/vps.php https://www.oderland.se/tjanster/cloudvps/ http://www.patrikweb.net/content/section/24/51/ http://www.ipeer.se/linux-vps.php https://www.crystone.se/vps http://www.surftown.se/vps/priser http://www.space2u.com/vps.php http://www.itstaden.se/Serverdrift/Virtuell+Server.html Virtuell Privat Server http://www.internetverket.se/premium-vps Molntjänster http://www.adminor.net/vps http://www.securehosting.se/index.php/virtual-servers http://foretag.netit.se/?page_id=564 http://acon.se/tjanster/virtuell-server/ https://www.dalnix.se/tjanster/
Continue reading »Heroku
Heroku Rails Receipes Running a migration heroku run rake db:migrate Clearing a PG database on heroku heroku pg:reset DATABASE WARNING: Destructive action postgresql-flexible-10203 will lose […]
Continue reading »CSS and SASS in Rails
A good article about organising CSS/SASS in Rails http://www.mattboldt.com/organizing-css-and-sass-rails/ Basically you have this in yourapp/assets/stylesheets/application.css /* NOTE: Not Application.scss */ /* *= require_self *= require […]
Continue reading »
Redefining Rails Models: Going Beyond Rails and Sometimes, Beyond Tables
Harnessing ActiveRecord Outside Rails ActiveRecord, the model component of Rails, is well-known for its versatility. It can be used within Rails, of course, but did […]
Continue reading »CSS Tips
To center an image, use margin: auto; and make it into a block element: img { display: block; margin: auto; width: 40%; } Highlight alla länkar som inte länkar nånstans! a[href=”#”], a[href=””], a:not([href]) […]
Continue reading »Rails Templates
Just use them! Save a bunch of time when startiung a new project. Here’s my latest fav: Rails 5.1 with Bootstrap, Font Awesome and Devise. […]
Continue reading »Java Dates and Periods
Period and Duration are not just alternatives, they work very different. Duration is designed to work in exact measurements in seconds and nanoseconds. However, Period […]
Continue reading »Rails Console tips
Sometimes you want to test queries etc from the Rails Console that requiers you to be logged in (for example via Devise). This is how […]
Continue reading »Rails Resources
Gems you NEED 12 gems every rails developer should know 2016 7 must have gems to install on any project 8 useful ruby on rails […]
Continue reading »The problem with Rails Asset Pipeline that I always stumble upon
You know how it is, you develop using Rails and it is going great! Tailwind and downhill, you develop with an amazing speed. Then when […]
Continue reading »Rails and Devise – Login using either username or email
This is essentially a no-nonsense step-by-step description of the most common case from: https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign-in-using-their-username-or-email-address 1) add a field to the User table rails generate migration […]
Continue reading »Javascript in 2017
The JS environment is, as we know, “complicated”. Every browser uses a different JavaScript engine: Chrome runs V8, Firefox runs SpiderMonkey, and Internet Explorer uses […]
Continue reading »Moving the MySQL data directory
Has this happened to you? You run for a while on the default installation of MySQL. The data increases and suddenly you realize that the […]
Continue reading »How to setup a Raspberry Pi as a NAS using Samba
http://www.simonthepiman.com/how_to_setup_windows_file_server.php
Continue reading »Capistrano!
How to deploy a Rails 4 app with Git and Capistrano
Continue reading »Calculating Historical Volatility
Historical Volatility shows how volatile an asset has been. There are numerous ways of calculating it, and I will show the most simple one here. […]
Continue reading »The Builder Pattern
Reasoning I won’t even go into why you should learn patterns. Patterns are canned knowledge! A problem the Builder Pattern solve It helps you avoid […]
Continue reading »Adding Stripe Payments to your Rails application
If you need to process payments, for example charging the user for using your great new website, Stripe is a great contender. An alternative is […]
Continue reading »Setting up 1000 Devise user accounts using fixtures
Seting up a one Devise user (version 3.5.1 and later) is simple in file <app>/test/fixtures/users.yml: tom: id: 11 name: TestUser email: test@example.org encrypted_password: <%= Devise::Encryptor.digest(User, ‘password’) […]
Continue reading »IOS App that scrolls both vertically and horizontally
Great example on how you create a “Netflix-lookalike” app with scrolling in bort vertical and horizontal direction. https://github.com/ThornTechPublic/HorizontalScrollingCollectionView
Continue reading »Test and Maximize network thruput
I had to transfer lots (LOTS) of video files from my IMAC where I had catptured a bunch of older DV tapes. Since space ran […]
Continue reading »A workflow to sort pictures and movies by date captured (EXIF data)
I have lots and lots of home made movies, mostly in the form of DV-tapes and SD-cards. (This workflow also works for photos and other […]
Continue reading »Hibernate and Java annotations
So….. I wanted to use something as neat and powerful as Rails’ ActiveRecord. I had used hibernate a bit a long time ago, and frankly […]
Continue reading »The Lazy Investor
I have started a new project. Since I do a fair share of investing, both in futures and stocks, I have tried several different ways […]
Continue reading »CheatSheet for creating an XCode IOS app with a UITableView
Setup Create a standard ViewController (NOT a TableViewController!) Drag a Table onto the ViewController. Snap to edges, Reset to “Suggested Constraints”. Option Cmd Shift = […]
Continue reading »