The tags sge and gridengine should be merged as they both refer to the family of cluster batch schedulers descended from Sun Grid Engine. I suggest making sge an alias to gridengine. While the Son of Grid Engine fork has picked up the initialization sge its predominantly used generically and the questions currently tagged sge are not specific to Son of Grid Engine (indeed one specifically refers to the competing Open Grid Scheduler fork). SGE also works as an expansion of Scalable Grid Engine which is the name Scalable Logic use for their supported version of the Open Grid Scheduler fork of Grid Engine.