It’sbeenalmosteightyearssinceIfirstupdatedAdvancedProgra妹妹ingintheUNIXEnvironment,andalreadysomuchhaschanged.•Beforethesecondeditionwaspublished,TheOpenGroupcreateda2004editionoftheSingleUNIXSpecification,foldinginthechangesfromtwosetsofcorrigenda.In2008,TheOpenGroupcreatedanewversionoftheSingleUNIXSpecification,updatingthebasedefinitions,addingnewinterfaces,andremovingobsoleteones.Thiswascalledthe2008versionofPOSIX.1,whichincludedversion7oftheBaseSpecificationandwaspublishedin2009.In2010,thiswasbundledwithanupdatedcursesinterfaceandreissuedasversion4oftheSingleUNIXSpecification.•Versions10.5,10.6,and10.8oftheMacOSXoperatingsystem,runningonIntelprocessors,havebeencertifiedtobeUNIX®systemsbyTheOpenGroup.•AppleComputerdiscontinueddevelopmentofMacOSXforthePowerPCplatform.FromRelease10.6(SnowLeopard)onward,newoperatingsystemversionsarereleasedforthex86platformonly.•TheSolarisoperatingsystemwasreleasedinopensourceformtotrytocompetewiththepopularityoftheopensourcemodelfollowedbyFreeBSD,Linux,andMacOSX.AfterOracleCorporationboughtSunMicrosystemsin2010,itdiscontinuedthedevelopmentofOpenSolaris.Instead,theSolarisco妹妹unityformedtheIllumosprojecttocontinueopensourcedevelopmentbasedonOpenSolaris.Formoreinformation,seehttp://www.illumos.org.
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