Many of our developers love to use the "awesome" window manager on Linux. However, RubyMine dialogs occasionally defocus while typing.

Here is a fix for that, tested on awesome 3.4, 3.5 and 4.0 (Ubuntu 14.04 and 16.04).

Problem

Consider the following:

1. Press Ctrl+Shift+N
2. "Find file" dialog opens
3. Type to search, file list appears
4. Type more, file list is being replaced

If your mouse pointer hovers the file list, the main window is focused when the list is being replaced (or simply when it shrinks and your mouse pointe...

VirtualBox does not offer anything for this task -- you need to do it yourself. It's not that hard:

Get more disk space

1. Add an extra virtual hard disk to the machine with the disk size you want to achieve.
2. Get a Linux live CD (like the Ubuntu live image) that offers fdisk, dd and gParted.
3. Boot the guest from the CD, open a terminal (on the guest, not the host!) and become root: sudo su
4. fdisk -l to see the disk information. \
   There should be one drive with some partitions and one without any....

This is now part of geordi. Please don't follow the instructions below, if you use geordi.

Inspired by the recent headless Selenium note, I found yet another solution for the problem to hide your selenium tests away.

This has the advantages
^

• not to require a gem (so you do not force this on others)
• to allow you to take a look at the running webdriver if necessary

Simply make a script th...

Travis changed their default distribution from Ubuntu 14.04 (trusty) to 16.04 (precise). This might break your test setup for new builds.

You can solve this issue by freezing your test distribution in the .travis.yml to Ubuntu 14.04 until you have the time to solve all the issues you will have in 16.04:

dist: trusty

Error details

Here are few indicators that you ran into this issue:

Connection to the PostgreSQL database does not work anymore

Your travis-ci builds might have started failing on the usual

psql -c...

From time to time, RubyMine suddenly did not accept any keyboard input and felt crashed, while mouse interaction was still possible. This apparently happens to all IntelliJ IDEs, especially on Ubuntu 14.04.

I've managed to fix it by having a shell script that exports XMODIFIERS="" when launching RubyMine, like this:

#!/bin/sh
XMODIFIERS= /home/arne/rubymine/bin/rubymine.sh

It has been working reliably for me ever since, at least until RubyMine 8.

An alternate solution suggested on the [Jetbrains issue tracker](https://youtrack....

Today, I ran into trouble on a fairly fresh installed VM, running Ubuntu. I tried to bundle install and got this stacktrace:

Fetching gem metadata from https://rubygems.org/.Unfortunately, a fatal error has occurred. Please see the Bundler 
troubleshooting documentation at http://bit.ly/bundler-issues. Thanks! 
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require': no such file to load -- net/https (LoadError)
	from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
	from /usr/li...

1. Install Ruby from the Ubuntu repository: sudo apt-get install ruby ruby-dev \
   ruby is the meta package. If you want to explicitly install 1.8 or 1.9, install ruby1.8 or ruby1.9 instead (the same applies for ruby-dev).
2. Do not install RubyGems from the repository but install the version from the webpage instead.
3. Get Bundler: sudo gem install bundler

Rails and other gems for a project should now be installed via bundle install from the...

Cause logstaglia is so cool you may want to record a video. We're lucky: Logstalgia has a parameter for an ppm-stream output: --output-ppm-stream FILE. We can pipe this to ffmpeg or avconv to record a h264 encoded video.

record command when using ffmpeg (for e.g. with ubuntu 12.04)

cat some_acces.log | logstalgia --sync -1920x1080 --output-ppm-stream - | ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i - -vcodec libx264 -preset ultrafast -pix_fmt yuv420p -crf 1 -threads 0 -bf 0 logstalgia.mp4

record command when using avconv(...

After you configured your ODBC describe in

• Fix [RubyODBC]Cannot allocate SQLHENV when connecting to MSSQL 2005 with Ruby 1.8.7. on Ubuntu 10.10
• and Connecting to MSSQL with Ruby on Ubuntu - lambie.org

you can connect with sequel:

require "rubygems"
require "se...

MuPDF is a PDF reader that renders very quickly, yet still correctly.

It supports PDF 1.7 and all the fancy shenanigans that evince (Ubuntu's default PDF reader) fails to render properly.

On Ubuntu, MuPDF is available in the Universe sources. Simply install via APT:

sudo apt-get install mupdf

Interaction primarily happens via keyboard, but there is basic mouse support.\
See the manpage for more details on navigating.

One downside: There is no printing support, so if...

When you have many changes, and you want to spread them across different commits, here is a way to stage all changes matching a given regular expression for a single commit.

Example

Consider the following git diff output.

diff --git a/file1.rb b/file1.rb
index 806ca88..36d536b 100644
--- a/file1.rb
+++ b/file1.rb
@@ -1,7 +1,5 @@
-# Here is a useless comment.
-# It will be removed.
 class File1
-  def foo
+  def bar
     # ...
   end
 end
diff --git a/file2.rb b/file2.rb
index 550e1c6..600f4e3 100644
--- a/file2.rb
+++ b/file2...

You might have some trouble running a Rails LTS 2 app with MySQL 5.7.

If you don't want to hack Mysql 5.6 into your modern Ubuntu or use the MySQL sandbox, you might want to try MariaDB 10.x.

MariaDB 10.x should work with both old and new Rails applications.

[Switch to MariaDB](https://makandracards.com/makandra/468343-how-...

I experienced a lot of issues with google chrome that made it almost impossible to work with it. Here are some of them:

• minimized windows stay hidden
• maximized windows overlap system bars (like the status bar of Ubuntu Mate on the top edge of the screen)
• windows cannot be resized

I finally discovered a setting that fixed these issues for me:

• go to chrome://settings/appearance
• activate Use system title bar and borders

I'm not sure if this setting was changed by me or if it was the browser default.

This may be awkward to set up, but will work once you're done.

Fun facts:

• In case of a connection loss the slave will try to reconnect to the master server and resume replication for the next 24 hours
• If you want to use your slave as a "real" MySQL server, you basically need to switch off replication (STOP SLAVE; RESET SLAVE; and reset your my.cnf) and restart the MySQL daemon.

Master server configuration

• Create replication user

  In the MySQL shell:

  CREATE USER 'replicator'@'%' IDENTI...
  

This describes all the steps you'll need to get Solr up and running for your project using the Sunspot gem.

Prepare Sunspot on your development machine

What you want in your Gemfile:

gem 'sunspot_rails'
gem 'sunspot_solr'
gem 'progress_bar' # for sunspot:solr:reindex

Now define what should be indexed within Solr from your ActiveRecord models, e.g.,

class Article << ActiveRecord::Base

  searchable do
    text :title
 ...

Update RubyGems and Passenger

Bundler requires Rubygems >= 1.3.6. Run gem update --system if you have an older version.
It also is not compatible with older versions of passenger, so bring that up to date as well (2.2.15 works).

If you installed RubyGems through apt (which you should never do!), you may see a message giving you a hint to use apt to update.
Some people advise to install the 'rubygems-update-1.3.7' gem on Ubuntu systems if you used apt to install RubyGems.
I did that - and lost all...

First of all: You could just use RVM which would make the pain go away. If for some reason you can't, proceed.

Do not use rubygems from the apt repository.

1. Get the latest RubyGems TGZ
2. Change to the download directory and extract it:\
   tar xvfz rubygems-1.3.7.tgz
3. If you previously had RubyGems installed via apt: \
   sudo apt-get remove rubygems
4. Install RubyGems:\
   cd rubygems-1.3.7 && sudo ruby setup.rb
5. Link gem to gem1.8:\
   `sudo ...

Ubuntu 12.04 LTS x64, Ruby 1.8.7, Rails 2.13, PDFKit 0.5.4, Phusion Passenger Apache 2

I ran into this, when I started using passenger to deal with the Single Thread Issue which caused my webrick to deadlock when an ActionController::RoutingError (No route matches "...") occurred.

These steps brought me a little further

(1) assert dependencies are installed

 sudo aptitude install openssl build-essential xorg libssl-dev

(2) only for 64bits OS Run one by one the follo...

When you simply want to get to know Puppet, follow puppetlabs’ Learning Puppet Docs. They give you a handy introduction inside a virtual machine they provide. You can watch the talk by Garrett Honeycutt 'Expanded Introduction to Puppet'.

Do not miss their cheatsheat and their [learn-puppet virtual machine](http://info.puppetl...

When your system is not running on English, you may sometimes want to run some applications and not use your system locale.
Use cases are scripts that parse output, or just using the (possibly) more common English labels or error messages. Here is how to do that.

I will use the date command and print the current weekday, just for the sake of an example.

Changing the locale using environment variables

Most often, setting LC_ALL for your command should be enough. The following was run on a system using a German locale.

$ date +%...

On your local system that only hosts non-critical development data and only you have access to, you can store MySQL's root password in your home directory so you can use mysql commands without prompt for passwords, i.e. when doing batch processing.

Of course, this has security implications. The password must be stored in plain text, so this method is out of the question if there's any confidential data in your databases. Assuming diligent screen-locking, an encrypted hard disk and correct permissions set on your credential file, it shoul...

sslscan is a nice tool to show details about TLS/SSL connections:

~> sslscan some-host-at.makandra.de

Testing SSL server some-host-at.makandra.de on port 443

  Supported Server Cipher(s):
    Failed    SSLv3  256 bits  ECDHE-RSA-AES256-GCM-SHA384
    Failed    SSLv3  256 bits  ECDHE-ECDSA-AES256-GCM-SHA384
    Failed    SSLv3  256 bits  ECDHE-RSA-AES256-SHA384
    Failed    SSLv3  256 bits  ECDHE-ECDSA-AES256-SHA384
    Rejected  SSLv3  256 bits  ECDHE-RSA-AES256-SHA
...

  Prefered Server Cipher(s):
    TLSv1  128 bits  ECDHE-RSA-A...

You may know the double asterisk operator from Ruby snippets like Dir['spec/**/*_spec.rb'] where it expands to an arbitrary number of directories.
However, it is disabled by default on most systems. Here is how to enable it.

If you check your globstar shell option, it is probably disabled:

$ shopt globstar
globstar           off

In that case, ** behaves just like * and will match exactly 1 directory level.

$ ls spec/**/*_spec.rb
spec/models/user_spec.rb

To enable it, run

shopt -s globstar

The double ast...

For all late night coders:

The program "redshift" changes your monitors' white balance according to your position on the planet and your local time. This is supposed to put less strain on your eyeballs than staring at a "daylight white" screen all day and night.
The program is in the Ubuntu repositories, so a simple "sudo apt-get install gtk-redshift" transfers it onto your hard drive.

I find the effect rather pleasing and so I have set the following alias on my computer:

alias rdshft='gtk-redshift -l 48.3714407:10.8982552 -t 6500:4200 &'...