Setting up Rails on Ubuntu needs Ruby, Bundler, and the right development packages; repository RubyGems often causes problems, and project gems should be installed with bundle install.

cpulimit caps a process's CPU usage by percentage, making batch jobs less greedy and adapting quickly to system load.

Persistent monitor button beeps on the Dell U2410 can be turned off through the on-screen display, avoiding an annoying sound every time a control is pressed.

Specs can stall for 30+ seconds when SOLR connections are left open and the pool is exhausted. Lowering the old-connection timeout reduces the delay.

Thunderbird 5 on Windows 7 can use translucent Aero toolbars and menubars; a userChrome.css tweak restores solid backgrounds.

Large XML files can exhaust memory when parsed at once; Nokogiri’s XML::Reader streams nodes one at a time for lower-memory processing.

Offshore agile projects demand more project-management discipline, risk handling, and trade-off decisions, while local client work relies more on relationships and expectation management.

Visibility checks can differ between DOM APIs and libraries, causing elements to be misclassified as shown or hidden. jQuery, jQuery 3, and Prototype use different rules.

console-for opens a remote Rails console on a Capistrano deployment target with one command, so staging and other environments can be accessed quickly.

Closing an expanded Pivotal Tracker story with the top-left arrow saves changes and can overwrite edits made by others. Use Cancel, Esc, or hover preview to avoid accidental data loss.

Install the SQLite driver for Ruby on Ubuntu when sqlite3-ruby cannot be used without the SQLite development libraries.

Zero-byte downloads in Rails 3 behind Apache/Passenger often come from missing X-Sendfile support, leaving file responses empty.

Cucumber step definitions for asserting whether visible link text is present or absent in Webrat or Capybara using selector-based matchers.

Dropbox can be integrated into Nautilus on Ubuntu for automatic file synchronization without using the web interface. The .deb package installs the client and keeps it updated through an APT source.

Choosing between custom software and a packaged solution depends on whether the supported process is a competitive advantage. Core processes often justify building; others usually fit a standard package better.

Nested forms need enough blank rows for new entries and a sensible minimum total for first-time input; build_nested_records balances both with configurable thresholds.

Password authentication can be tested by forcing SSH to skip public key login and prefer passwords. The same options also work with scp for file copies.

Switching Selenium from Firefox to Chrome requires a matching chromedriver and Capybara driver configuration. Older Capybara versions need a manual Selenium WebDriver setup.

Renaming an Ubuntu machine requires updating /etc/hostname and /etc/hosts; the new hostname takes effect after reboot or with hostname your.hostname.

Shell scripts often need to forward every command-line argument without hardcoding positions. $@ expands to all parameters in both sh and bash.

Perl script for diagnosing MySQL databases and suggesting configuration changes to improve performance.

Ruby has a reverse of Rails' each(&:method) shorthand for calling an object method with each element: each(&object.method(:call)).

Set a file's modification time in Ruby with FileUtils.touch; it can create missing files and update multiple paths at once.

passenger-memory-stats lists Passenger processes with application directories and memory usage, making it easy to identify which Rails apps are currently served.