UNIX操作系统分类 Mach BSD System V3 OSF/ System V 4 NEXT STER SCO BSD UNⅨX BSD/ IRIX ns SunOS Solaris Linux HP-UX -UNIX definion DEC 10 0sF/1 AIX UNiX implementation NEXTSTEP is derived from BS043 44 UNIX 操作系统分类