Of software, used to emphasise that a program is unaware of some important fact about its environment, either because it has been fooled into believing a lie, or because it doesn' t care. The sense of "happy" here is not that of elation, but rather that of blissful ignorance. "The program continues to run, happily unaware that its output is going to /dev/null." [Jargon File]

In addition suitable contents:
[ = ] [ am ] [ an ] [ app ] [ ar ] [ arc ] [ arg ] [ as ] [ at ] [ au ] [ aw ] [ b ] [ be ] [ bo ] [ ca ] [ ch ] [ co ] [ con ] [ de ] [ /dev/null ] [ do ] [ du ] [ ec ] [ ed ] [ ee ] [ environment ] [ er ] [ es ] [ fact ] [ fi ] [ file ] [ fo ] [ gn ] [ gr ] [ h ] [ hat ] [ hr ] [ id ] [ ie ] [ il ] [ import ] [ in ] [ int ] [ io ] [ ir ] [ iron ] [ is ] [ it ] [ J ] [ Jargon File ] [ la ] [ Lex ] [ li ] [ ly ] [ mo ] [ mod ] [ module ] [ mp ] [ na ] [ nc ] [ ng ] [ no ] [ ns ] [ nu ] [ null ] [ O ] [ om ] [ output ] [ ph ] [ port ] [ pr ] [ program ] [ py ] [ query ] [ rc ] [ re ] [ ro ] [ ru ] [ run ] [ se ] [ si ] [ sn ] [ so ] [ software ] [ T ] [ th ] [ to ] [ tp ] [ tw ] [ us ] [ vi ]