[root@oldboylinux ~/test]#cat /etc/inittab
# 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) 关机
# 1 - Single user mode单用户模式
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)无网络多用户模式
# 3 - Full multiuser mode 有网络多用户模式
# 4 - unused 未使用
# 5 - X11 有网络支持有X-Window支持的多用户模式
# 6 - reboot (Do NOT set initdefault to this) 重新引导系统,即重启
#
id:3:initdefault:
[root@oldboylinux ~/test]#
/etc/inittab 中有定义
0 关机
1 单用户
2 无网络多用户
3 有网络多用户
4 未使用
5 有网络支持有X-Window支持的多用户模式
6 - reboot (Do NOT set initdefault to this) 重新引导系统,即重启
/etc/inittab文件中定义了Linux的六个运行级别,从0到6,分别代表关机、单用户模式、无网络多用户、有网络多用户、未使用、有X-Window支持的多用户模式和重启系统。了解这些级别有助于管理和维护Linux系统。
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