fedora9开始，UPSTART取代传统的init工作模式，/etc/inittab文件只是一个过渡阶段，用于描述系统的启动级别，文件的头几行说的很明白。
# System initialization is started by /etc/event.d/rcS
# /etc/evend.d/rcS 进行系统初始化，其实就是运行/etc/rc.d/rc.sysinit(会调用/etc/init.d/functions)
# Individual runlevels are started by /etc/event.d/rc[0-6]
# 执行那个运行级别，启动相应的服务等。依靠/etc/init.d/rc脚本，决定是否进入交互模式；启动相关服务
# Ctrl-Alt-Delete is handled by /etc/event.d/control-alt-delete
# 当control-alt-delete时，关机
# Terminal gettys (tty[1-6]) are handled by /etc/event.d/tty[1-6] and serial file
定义系统终端
待续....
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