meaning of bug for bug
1. bug-for-bug compatible Same as bug-compatible, with the additional implication that much tedious effort went into ensuring that each known bug was replicated. [Jargon File] buglix /buhgliks/ Pejorative term referring to DECs ULTRIX operating system in its earlier *severely* buggy versions. Still used to describe ULTRIX, but without nearly so much venom. Compare AIDX, HP-SUX, Nominal Semidestructor, Telerat, sun-stools. BUGSYS