Turn an unused Caps Lock into a second Escape key for faster modal editing and keyboard-driven workflows.

url_for accepts only one argument, so extra query parameters fail. polymorphic_url builds the same link and keeps additional params.

update_all can ignore conditions when :order and :limit are present, causing unintended bulk updates in Rails 3.

Non-ASCII values in HTTP headers need RFC 5987-style encoding, especially for filenames in Content-Disposition downloads with plain ASCII fallbacks.

Capybara and selenium-webdriver version mismatches can break element interaction with a private select method error. Aligning gem versions avoids the API incompatibility.

Skype messages with typos can be corrected after sending by reopening the last or any current-session message and editing it in place.

Create a file with an exact target size on Linux for testing or temp data, using dd or zero-filled writes.

Centralizing Linux configuration in a Git-backed ~/.dotfiles repository keeps settings versioned and easy to sync across machines.

Run a tiling window manager inside GNOME to keep GNOME services while gaining automatic layouts and multi-monitor workspaces.

Hoptoad has been renamed to Airbrake after a trademark dispute over frog- and toad-related names.

VirtualBox lacks a built-in VDI resize feature; enlarging the disk means cloning to a larger virtual drive and expanding the partition afterward.

dd copies can run silently until completion or failure; pkill -USR1 dd or status=progress reveals live transfer progress.

Windows 7 creates hidden Thumbs.db files in image folders, adding clutter to archives and shared files. Group Policy can stop thumbnail caching and file creation.

Inspect a gem's dependency requirements before installation to avoid surprises and see development-time packages such as hoe, rake-compiler, and rexical.

Ruby 1.8 lacks look-behind in Regexp; Oniguruma provides zero-width assertions such as positive and negative look-behind for pattern matching.

Mobile browsers can trigger accidental text highlighting and copy menus, confusing users. A small JavaScript/jQuery workaround suppresses selection on touch devices.

Puppet manifests can be hard to read in vi without syntax coloring. Installing vim-puppet or adding a syntax bundle enables highlighting for .pp files.

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.