004_入门篇_Linux概述（三）_Linux和Unix的渊源

	Linux 和 Unix的渊源
		
		|   Multics 贝尔实验室
		|       ↓
		|     UNIX-----------------------------------------+
		|       |                                          |
		|       +---------+-----------+----------+         |
		|       ↓         ↓           ↓          ↓         ↓
		|      BSD     Solaris     IBM-AIX     HP-UX     Minix
		|       |                                          |
		|       +-----------+                              |
		|       ↓           ↓                              ↓
		|    FreeBsd-----→Darwin                         Linux
		|                   ↓
		|          welcome to Mac OS X