Fast Ruby profiling by sampling stack traces at intervals, suitable for production and CPU-focused performance analysis with raw dump inspection.

Routing error in Rails 3.2.22.1 can appear when concerns is passed as an option to resources, producing broken routes and failed controller specs.

Chrome no longer supports 32-bit Linux builds, which can break apt-get update with a repository Release fetch error. Updating the APT source to amd64 avoids the failure.

return 444 makes nginx close a connection without sending a response, useful for rejecting specific routes or simulating dropped requests behind a reverse proxy.

Finding a matching text node in nested DOM trees is tricky because broad text queries return ancestor elements too. Selecting the deepest element avoids false matches in Capybara, XPath, and jQuery.

Reversing element order with CSS helps make inline lists stack in a different visual order on small screens without changing the markup.

Count network connections by remote IP and sort them to spot hosts with many open or lingering sessions. Works on FreeBSD and Linux using netstat and shell tools.

Chrome extension for inspecting Google Analytics tracking in complex setups. Opens in the developer console and stays lighter than broader tag-assistance tools.

Cross-platform filesystem metrics are awkward to gather in Ruby; sys-filesystem uses FFI to provide them without parsing df output.

RSpec one-liners can assert expectations on subject with implicit example descriptions, using should or is_expected in expect-based syntax.

Angular directives can project original content into a template, and the transclusion function allows custom processing before insertion into the DOM.

Logstalgia can export a PPM stream for recording a synchronized H.264 video through ffmpeg or avconv.

Local changes can block git pull --rebase; automatic stashing saves and reapplies them around the pull, but conflicts may still occur.

Bundler needs network access to api.rubygems.org; behind a proxy, https_proxy or http_proxy lets bundle install fetch gems and deploy with Capistrano.

Safer browser console logging makes debugging easier: %o interpolation keeps values readable, and object shorthand lets structured data expand interactively.

Rails hashes can be turned into URL query strings with Hash#to_query; browser-side nested objects can be serialized with jQuery $.param.

Rails 2.3 tests can fail with NoMethodError: undefined method 'cache' for Gem:Module when used with newer RubyGems; downgrading RubyGems restores generator lookup behavior.

Geordi 1.3 adds Cucumber support with @solo handling, Capistrano 2/3 deployment fixes, and updated Firefox setup for selenium testing.

Use SQL views in a Rails app without switching the schema format to SQL; Scenic adds versioned, reversible migrations and keeps view definitions in SQL files.

Dashboard and query tools for Elasticsearch provide local access to Kibana and Sense through Marvel plugins.

column aligns delimited text into readable tables in bash, making pipe-separated output and other simple listings easy to format.

Script to migrate test suites from RSpec 2 to RSpec 3, including syntax beyond should and expect.