Show the name and version of your Linux distribution
To list the name and version of your Linux distribution, type the following:
cat /etc/*-release
Related cards:
RSpec: Leverage the power of Capybara Finders and Matchers for view specs
View specs are a powerful tool to test several rendering paths by their cases instead of using a more costing feature spec. This is especially useful because they become quite co...
Show the character set and the collation of your MySQL tables
To show the collation of your tables you have to login to the MySQL console and execute SHOW TABLE STATUS FROM database;
mysql> SHOW TABLE STATUS FROM test;
+-------------+--------+---------+------------+------+----------------+--------...
How to resize your boot partition when there is an encrypted partition after it
Boot partitions from installations prior to the 16.04 era are terribly small. When you install updates and encounter errors due to a full /boot partition, consider risizing it.
If you can't do the steps described below, ask someone experienced ...
Upgrading Cucumber and Capybara to the latest versions available for Rails 2
Specify these gem versions in your Gemfile:
gem 'cucumber', '~> 1.3.0'
gem 'cucumber-rails', '= 0.3.2' # max version for Rails 2
gem 'capybara', '< 2' # capybara 2+ requires Rails 3
gem 'mime-types', '< 2' # dependeny of capybara
...
Video transcoding: Web and native playback overview (April 2020)
Intro
Embedding videos on a website is very easy, add a <video> tag to your source code and it just works. Most of the time.
The thing is: Both the **operating system and Browser of your client must support the container ...
The Ruby Object Model
In Ruby (almost) everything is an Object. While this enables a lot of powerful features, this concept might be confusing for developers who have been programming in more static languages, such as Java or C#. This card should help understanding t...
CSS: Matching against attributes and their values (or parts of them)
You probably know that you can use CSS selectors to match against elements and their attributes, such as:
a[title] { /* any <a> that has a "title" */ }
a[data-fancy="true"] { /* any <a> that has their "data-fancy" attribute set to "true" *...
Capistrano: How to find out which version of your application is currently live
When deploying, Capistrano puts a REVISION file into your application's release directory. It contains the hash of the commit which was deployed.
If you want to know the currently deployed release, simply SSH to a server and view that file.
``...
Installing multiple MySQL versions on the same Linux with mysql-sandbox
Ubuntu has a package mysql-sandbox that lets you install multiple MySQL versions into your user home:
- Install
mysql-sandbox
sudo apt install mysql-sandbox
- Download the version of MySQL you want to use from mysql.com:
<https://...
Change the name of your Ubuntu machine
In order to rename your Ubuntu box, replace all occurences of the the old name in the following two files:
/etc/hostname/etc/hosts
After a reboot your hostname is changed. If you don't want to reboot your Ubuntu box you have to execute ...