说明：  Sun的操作系统最初叫做SunOS，由于Sun Microsystem的创始人之一，Bill Joy来自U.C.Berkeley，因此SunOS主要是基于BSD UNIX。
(Sun s operating system was originally called SunOS, due to one of Sun Microsystem s founder , Bill Joy from UCBerkeley, SunOS therefore mainly based on BSD UNIX. )