init 系统运行级别
[root@hexingxing ~]# init 0 #关机[root@hexingxing ~]# init 1 #单用户[root@hexingxing ~]# init 2 #不包含 NFS 的多用户[root@hexingxing ~]# init 3 #多用户[root@hexingxing ~]# init 4 #未分配[root@hexingxing ~]# init 5 #图形界面[root@hexingxing ~]# init 6 #重启[root@hexingxing ~]# runlevel #查看当前系统运行级别
N 5 ##N 指上个运行级别，5 指当前运行级别[root@hexingxing ~]# cat /etc/inittab #查看或修改默认运行级别
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:提示： id:3:initdefault: #表示当前默认的运行级别为多用户模式
注意： 0 和 6 不可设置为默认，否将永远开不了机
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