By default, only application.js, application.css and all non-JS/CSS files are precompiled into public/assets.

If you have asset manifests in non-standard locations, declare them in your config/application.rb:

config.assets.precompile += ['application/all.css', 'result/all.css', 'application/all.js', 'result/all.js']

This way you can also precompile files that do not have any manifest.

This looks like it is safe to use:

2.2.1 :001 > a = b = "hello world"
"hello world"
2.2.1 :002 > a
"hello world"
2.2.1 :003 > b
"hello world"
2.2.1 :004 > b = " goodbye!"
" goodbye!"
2.2.1 :005 > a
"hello world"
2.2.1 :006 > b
" goodbye!"

But it isn't!

2.2.1 :010 > a = b = "hello world"
"hello world"
2.2.1 :011 > a
"hello world"
2.2.1 :012 > b
"hello world"
2.2.1 :013 > b << " goodbye!"
"hello world goodbye!"
2.2.1 :014 > a
"hello world goodbye!"
2.2.1 :015 > b
"hello world goodbye!"

What is happening when we do `a = b = ...

You can now define this step without Cucumber raising Cucumber::Ambiguous:

Then /^I should see "whatever I want"$/ do
  ...
end

This is available in Spreewald 1.5.0+.

Cucumber raises a Cucumber::Ambiguous if more than one step definitions match a step.

Our new cucumber_priority gem provides a way to mark step definitions as overridable, meaning that they can always be overshadowed by a more specific version without raising an error.

This gem is currently used by spreewald and cucumber_factory.

Marking step definiti...

Spreewald 1.4.0 comes with this step:

When I click on the element ".sidebar"

We recommend to define a selector_for method in features/support/selectors.rb so you can refer to the selector in plain English:

When I click on the element for the sidebar

Logging tcpdump output all the time can create a huge amount of data. This can be both: too much data size on HDD and tiring to analyze. You can run a script in a screen which checks out the packages transfered per second and start a tcpdump when the packages exceed a fixed number.

#!/usr/bin/env bash

interface=eth0
dumpdir=/tmp/
packet_threshold=5000
log_packets=100000

while /bin/true; do
  pkt_old=`grep $interface: /proc/net/dev | cut -d :  -f2 | awk '{ print $2 }'`
  sleep 1
  pkt_new=`grep $interface: /proc/net/dev | cut -d :  -f...

Spreewald 1.3.0 comes with these steps:

Then I should see an element ".panel"
Then I should not see an element ".sidebar"
Then I should see an element ".twitter-timeline"

We recommend to define a selector_for method in features/support/selectors.rb so you can refer to the selector in plain English:

Then I should see an element for a panel
Then I should not see an element for the sidebar
Then I should see an element for the Twitter timeline

Activate VI mode by running

set -o vi

Now use your Bash as if it were VI! Hit Esc to enter command mode, jump around with e, w, b, 0, $ etc. and edit just as you're used to.

Bash history is searched with /. See the linked cheat sheet for more hints.

This class contains nerdcore things such as disassembling a piece of Ruby into VM calls or enabling tail-call optimization.

Also see this article about enabling TCO on a per-method basis.

As we get an exception notification, when a cron job fails, we wish to have the full backtrace in this mail. A rake task doesn't output the full backtrace by default, so you need the --backtrace option.

Trigger

You will find fail mails with a shortened backtrace

#[...]
Tasks: TOP => some_namespace:some_task
(See full trace by running task with --trace)

What rake wants from you
Running the rake task like rake some_namespace:some_task --backtrace

How this works with whenever
Define a own job_type and use it for r...

When there's a Gemfile.lock in your working directory that you cannot remove by either checkout, reset [--hard], stash, probably Rails' Spring is the culprit and not Bundler itself.

Fix

spring stop

The author of the linked Stackoverflow post supposes Spring re-writes the Gemfile.lock on change to ensure all Spring processes are using the same gem versions. Meh.

Live markdown previewer (with Github flavored syntax) for VIM.

Will open a preview in your browser and update automatically on each key press.

I had a very frequent cronjob that in rare cases could be relatively slow. To avoid multiple instances of this cronjob running in parallel, I decided to use flock to ensure that only one instance could run at a time.

flock works by acquiring a lock to a file, and if it can do so running a command. In order not to wait but simply give up when the file is locked, you can add -n:

flock /tmp/my.task.lock -n -c "bin/my-long-running-job"

Using whenever, and since this was a rake task, the follo...

MutationObserver provides developers a way to react to changes in a DOM. Any: insertion, deletion, attribute change – anything.

Quickstart: https://davidwalsh.name/mutationobserver-api

Relevant caniuse.com search: http://caniuse.com/#feat=mutationobserver

Command line text editor with syntax highlighting, menus (F1), etc.

This might be a worthy replacement for nano if you don't want to use vim.

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....

Web safe fonts are fonts that are pre-installed by many operating systems. While not all systems have the same fonts installed, you can use a web safe font stack to choose several fonts that look similar, and are installed on the various systems that you want to support. If you want to use fonts other than ones pre-installed, as of CSS3, you can use Web Fonts.

If you need to install any of the widely-supported fonts listed there, you'll probably find them at www.fontpalace.com.

Table of contents of the linked article:

What are Web Fonts?

• Advantages of Web Fonts
• Disadvantages of Web Fonts
  • Fallback Fonts
  • CSS3 @font Declaration Example
  • Fallback Font Example
  • Render Blocking and Critical Rendering Path
  • FOIT

Optimizing Web Font Delivery Further

• Prioritize Based On Browser Support
• Choose Only Styles You Need
• Character Sets
• Host Fonts Locally or Prefetch
• Store in LocalStorage with Base64 Encoding
• Another Method

Web Font Pe...

A JS library that allows you to embed an iframe that automatically shrinks or expands to match its content.

(Untried.)

You can configure a stat socket for haproxy in the global section of the configuration file:

global
  daemon
  maxconn 999
  user foobar
  stats socket /var/run/haproxy.stat  # this is the line you want to configure

You need socat to query data from this socket.

After installing socat and reconfiguring haproxy you can use this socket to query data from it:

• show informations like haproxy version, PID, current connections, session rates, tasks, etc..

  echo "show info" | socat unix-connect:/var/run/haproxy.stat stdio
  

...

After restarting an OpenStack host you may encouter problems with missing iptables rules (we're on an quite old release of OpenStack currently. Maybe this is fixed in newer releases). The nova chains appear in the iptables -L output but they're empty. NAT is working fine. The reason is, that the NAT chains are configured by nova-network while the filter rules are managed by nova-compute. I didn't manage to find the cause of this behaivour yet, but I think it has something to do with the start order of the nova services. (When `nova-net...

Use this snippet by Achu from Ask Ubuntu:

ping hostname.tld | while read pong; do echo "$(date): $pong"; done

This gives you lines like:

Wed Nov  4 10:32:31 CET 2015: 64 bytes from 1.2.3.4: icmp_seq=298 ttl=61 time=0.673 ms
Wed Nov  4 10:32:32 CET 2015: 64 bytes from 1.2.3.4: icmp_seq=299 ttl=61 time=0.616 ms
Wed Nov  4 10:32:33 CET 2015: 64 bytes from 1.2.3.4: icmp_seq=300 ttl=61 time=1.04 ms