Since version 1.5 RubyGems requires at least Ruby 1.8.7. The last one working with Ruby 1.8.6 was RubyGems 1.4.2.
When installing RMagick you may get an error messages like this: Version 2.13.1: checking for Ruby version >= 1.8.5... yes
If you want to manually check if e-mail delivery works on a machine by sending an e-mail you...
When you write a custom RSpec matcher a good place to store them is to create one file per matcher...
The information in this card is only relevant for Rails 2.3-era apps. This note gives a quick introduction into...
If you just upgraded to Bundler 10.0.10 you might get the following error when bringing up Rails: /usr/lib/ruby/1.9.1/psych.rb:148:in...
blueprint is DevStructure’s workhorse tool that looks inside popular package managers, finds changes you made to configuration files, and...
Specify these gem versions in your Gemfile: gem 'cucumber', '~> 1.3.0' gem 'cucumber-rails', '= 0.3.2' # max version for Rails 2
The shell variable PS1 holds your bash prompt. You might want to change it to serve your needs best. Here...
Add deprecation warnings and their solution or link to available solutions. Global access to Rake DSL methods is deprecated. Please...
Install OpenSSH Server: sudo apt-get install openssh-server To check if the server is running you should get no...
An overview of common vim commands, including: windows buffers undo/redo navigation bookmarks selection/whitespace clipboard shortcuts search/replace programming external filters
When you style multiple adjacent block elements with float: left, they will be rendered next to each other similar to...
After updating your RubyGems, you will probably not be able to run Capistrano any more, but receive an error similar...
My T410 has a NVIDIA graphics card (NVS 3100M). My BIOS configuration looks like this: NVIDIA Optimus is disabled in...
Although you can access many symbols using the AltGr key you may be missing some, like the en-dash (–) or...
Note: For PostgreSQL you should use advisory locks. For MySQL we still recommend the solution in this card.
When you have a Cucumber step like Then I should see "Did you see those \"quotation marks\" over there...
There is no good equivalent for the Unix sudo command in Windows. Below are a few workarounds that are all...
This note is a reminder that there is something called AppArmor that could cause weird errors ("File not found", "Can...
To open a terminal quickly navigate to System → Preferences → Keyboard Shortcuts. There, click the "Run a terminal" row (It should...
Have a backup. Stop MySQL: sudo service mysql stop Move (or copy) your mysql directory. If you want /mnt/mysql to...
Using OpenSSL it's very easy to seriously encrypt files. Use the script below. Input / Output are self explanatory. Put...
When you delete a file with rm it's still possible to recover the file or parts of it. Use...