Sorted:

problem about shell-script-Collection of common programming errors

Rails3 – RSpec – How to set request.env?-Collection of common programming errors

Rails rspec visit devise, ActionView::Template::Error undefined application_helper method-Collection of common programming errors

Inputting elements of unknown type into a vector-Collection of common programming errors

Is there a way to do spell check and read receipts with Yahoo mail?-Collection of common programming errors

Simplify (-4x+6)/(x^2-9) – (-5x+3)/(x^2-9)?-Collection of common programming errors

Is there any special steps to take to load an external library into my .so for Kdevelop plugin-Collection of common programming errors

problem about bit-shift-operators-Collection of common programming errors

Difference between – and -​- in compiling options-Collection of common programming errors

Undefined method `sub' while running rake assets:precompile on Windows-Collection of common programming errors