# The default runlevel.
id:2:initdefault: #表示当前缺省运行级别为2
代码如下:
# Boot-time system configuration/initialization script.
# This is run first except when booting in emergency (-b) mode.
si::sysinit:/etc/init.d/rcS #系统初始化的进程
代码如下:
# What to do in single-user mode.
~~:S:wait:/sbin/sulogin
代码如下:
# /etc/init.d executes the S and K scripts upon change
# of runlevel.
#
# Runlevel 0 is halt.
# Runlevel 1 is single-user.
# Runlevels 2-5 are multi-user.
# Runlevel 6 is reboot.
代码如下:
l0:0:wait:/etc/init.d/rc 0
l1:1:wait:/etc/init.d/rc 1
l2:2:wait:/etc/init.d/rc 2
l3:3:wait:/etc/init.d/rc 3
l4:4:wait:/etc/init.d/rc 4
l5:5:wait:/etc/init.d/rc 5
l6:6:wait:/etc/init.d/rc 6
# Normally not reached, but fallthrough in case of emergency.
z6:6:respawn:/sbin/sulogin
代码如下:
# What to do when CTRL-ALT-DEL is pressed. #在启动过程中是否允许按CTRL-ALT-DELETE重启系统
#ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now
代码如下:
# Action on special keypress (ALT-UpArrow).
#kb::kbrequest:/bin/echo "Keyboard Request--edit /etc/inittab to let this work."
代码如下:
# What to do when the power fails/returns.
pf::powerwait:/etc/init.d/powerfail start
pn::powerfailnow:/etc/init.d/powerfail now
po::powerokwait:/etc/init.d/powerfail stop
代码如下:
# /sbin/getty invocations for the runlevels.
#
# The "id" field MUST be the same as the last
# characters of the device (after "tty").
#
# Format:
# <id>:<runlevels>:<action>:<process>
#
# Note that on most Debian systems tty7 is used by the X Window System,
# so if you want to add more getty's go ahead but skip tty7 if you run X.
# getty进程来提供虚拟终端设备的服务
1:2345:respawn:/sbin/getty 38400 tty1
代码如下:
#标签字段的值是1,1是设备tty1的数字后缀,tty1与相应的进程相关联,该getty进程可以启动的runlevel是2,3,4和5,当该进程终止时,init马上就重新启动它。启动进程的路径名是/sbin/getty,该进程是实现虚拟终端支持的最小版本的getty,为tty1提供启动虚拟设备的进程。
2:23:respawn:/sbin/getty 38400 tty2
#3:23:respawn:/sbin/getty 38400 tty3
#4:23:respawn:/sbin/getty 38400 tty4
#5:23:respawn:/sbin/getty 38400 tty5
#6:23:respawn:/sbin/getty 38400 tty6
# Example how to put a getty on a serial line (for a terminal)
#
#T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
T1:23:respawn:/sbin/getty -L ttyS1 115200 vt100
# Example how to put a getty on a modem line.
#
#T3:23:respawn:/sbin/mgetty -x0 -s 57600 ttyS3