Keyboard remapping in Ubuntu lets you change key behavior when layouts or hardware keys are inconvenient. xmodmap can adjust mappings using keycodes from xev.

Lightweight WYSIWYG HTML editing for web apps, with a cleaner interface than TinyMCE or CKEditor and Rails integration.

Launch the GNOME disk utility from the terminal with sudo palimpsest.

Use rvm in a script shebang to run Ruby with a specific version instead of the system default.

Absolutely positioned boxes can use opposing offsets on both sides in modern browsers; only IE6 and older break this layout.

Need to remove cookie data during a Capybara scenario when browser state must reset before the test ends.

Periodic command output in an awesome panel can be turned into a widget with a timeout timer and escaped text.

Split panes in LibreOffice Calc can end up in awkward positions; moving the dividers off screen and toggling splitting restores the default layout.

ActiveRecord can inherit without STI when no type column exists or inheritance_column is overridden, making form models and presenters possible.

Copying a Git repository with every branch and tag requires a bare clone and a mirror push to preserve the full ref set.

Runtime checks can identify the current RSpec spec type, letting shared setup run only for controller, helper, or request/response-aware examples.

Feature and spec code may need different behavior when Rails env is unavailable. Capybara.current_driver can distinguish Cucumber scenarios from RSpec examples.

HTTP referer headers can persist across a 301 redirect, affecting analytics and referrer-based logic.

git shortlog -s -n lists contributors by commit count for a revision range, making it easy to find the most active authors.

Local SSL development with Thin avoids mixed-content and redirect issues while testing force_ssl on localhost using a self-signed certificate and separate HTTP and HTTPS ports.

Local HTTPS development often needs a trusted certificate; openssl or mkcert can create self-signed X.509 certificates for testing without browser warnings.

Duplicate model, attribute, and error translations for ActiveRecord and ActiveModel by reusing YAML anchors and aliases instead of maintaining separate locale entries.

Build RegExp objects from strings, but literal characters are not escaped automatically. Escaping input avoids unintended matches, and flags are passed as a second argument.

Remove a stuck app icon from Launchpad by deleting its entry from the Dock database and restarting Dock.

Accessing the AngularJS scope attached to a rendered DOM node helps inspect or manipulate repeated elements, useful for advanced directives and drag-and-drop trees.

Need a quick view of changed files without the full patch; git diff --name-only lists filenames, while --stat and --numstat add compact change counts.

Ruby Date uses different weekday and week-number conventions for ISO 8601 and North American calendars, affecting year boundaries and week calculations.