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shutdown

解释

关机重启命令

语法

shutdown [选项] 时间-c 取消前一个关机命令-h 关机-r 重启

示例

# 现在立刻关机
shutdown -h now# 定时关机
shutdown -h 20:30# 现在立刻重启
shutdown -r now

其他关机命令

halt
poweroff
init 0

其他重启命令

reboot
init 6

系统运行级别

0   关机
1   单用户(启动最小的服务,用来做修复,类似windows安全模式)
2   不完全多用户,不含NFS(network file system)服务
3   完全多用户
4   未分配
5   图形界面
6   重启

查看运行级别的方法

cat /etc/inittab
上面的centos7 已取消运行级别,使用targets取代[root@izm5e2q95pbpe1hh0kkwoiz ~]# cat /etc/inittab
# inittab is no longer used when using systemd.
#
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target
#
# systemd uses 'targets' instead of runlevels. By default, there are two main targets:
#
# multi-user.target: analogous to runlevel 3
# graphical.target: analogous to runlevel 5
#
# To view current default target, run:
# systemctl get-default
#
# To set a default target, run:
# systemctl set-default TARGET.target# 查看运行级别
systemctl get-default[root@izm5e2q95pbpe1hh0kkwoiz ~]# systemctl get-default
multi-user.target# multi-user.target: analogous to runlevel 3
# graphical.target: analogous to runlevel 5

logout

解释

退出登录