linux文件存放目录详解

/etc 存放各种配置文件

/etc/inittab 控制启动模式
[root@localhost ~]# 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) （多用户模式）
# 3 - Full multiuser mode （命令行模式）
# 4 - unused （没有使用）
# 5 - X11 （桌面模式）
# 6 - reboot (Do NOT set initdefault to this)（重启）
# id:3:initdefault:

查看运行级别

[root@localhost ~]# runlevel
N 3

不同模式切换
init 数字