/etc/
/inittab 初始化脚本
/init.d/rcS 启动挂载
/fstab 文件系统挂载表
/profile

/hostname 主机名
/hosts
/passwd 密码信息
/shadow 密码信息
/issue 交互登录前，显示的提示信息

(1) inittab
# Startup the system
null::sysinit:/bin/mount -o remount,rw /
null::sysinit:/bin/mount -t proc proc /proc
null::sysinit:/bin/mount -a
null::sysinit:/bin/hostname -F /etc/hostname# Now run any rc scripts

::sysinit:/etc/init.d/rcS # Now invoke shell
::askfirst:/bin/ash # Logging junk
null::sysinit:/bin/touch /var/log/messages
null::respawn:/sbin/syslogd -n -m 0
null::respawn:/sbin/klogd -n # Stuff to do for the 3-finger salute
::ctrlaltdel:/sbin/reboot # Stuff to do before rebooting
null::shutdown:/usr/bin/killall klogd
null::shutdown:/usr/bin/killall syslogd
null::shutdown:/bin/umount -a -r
null::shutdown:/sbin/swapoff -a

(2) rcS

#!/bin/ash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
runlevel=S
prevlevel=N
umask 022
export PATH runlevel prevlevel
#mount rootfs success
/bin/mount -a
#
/bin/echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s
# Configure net interface
/sbin/ifconfig lo 127.0.0.1 up
/sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo
/sbin/ifconfig eth0 192.168.2.25 netmask 255.255.255.0
/sbin/route add default gw 192.168.2.1

(3)fstab
#device mount-point type option dump fsck order
proc /proc proc defaults 0 0
none /tmp ramfs defaults 0 0
sysfs /sys sysfs defaults 0 0
mdev /dev ramfs defaults 0 0
(4)profile
#Set search library path

#Set user path
USER="id -un"
LOGNAME=$USER
PS1=‘[\u@\h=W]#‘
PATH=$PATH
HOSTNAME=‘/bin/hostname‘
export USER LOGNAME PS1 PATH

(5)hostname

(6)issue