Reference Hirofumi:
https://blog.csdn.net/u013686019/article/details/26846571
#! /bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:
runlevel=S
Operating system level is set to S (single user mode), i.e., single-user mode, only a console terminal, for "root" account for system maintenance.
prevlevel = N
umask 022
Create a file or folder, their default permissions -umask basic code permission (mask bit), predetermined, basic code rwxrwxrwx folder (777), the basic code file rw-rw-rw- (666)
export PATH runlevel prevlevel
#
# Trap CTRL-C &c only in this shell so we can interrupt subprocesses.
#
trap ":" INT QUIT TSTP
Capture INT, QUIT, TSTP signal
trap to capture shell command signal, there are three basic forms:
(. 1) trap "cmd" signal-list
trap signal-list received signal with the same listed Execute cmd
( 2) trap signal-list
performs the default operation signal itself
(3) trap "" signal- list
ignore signals specified signal-list
/bin/hostname iTOP-iMX6-XIANG
Set the host name
#/bin/mount -n -t proc none /proc
#/bin/mount -n -t sysfs none /sys
#/bin/mount -n -t usbfs none /proc/bus/usb
#/bin/mount -t ramfs none /dev
[ -e /proc/1 ] || /bin/mount -n -t proc none /proc
[ -e /sys/class ] || /bin/mount -n -t sysfs none /sys
[ -e /dev/tty ] || /bin/mount -t ramfs none /dev
Mount "virtual" file system, -t specify the type of file system, -n just simply mount, and not to write / etc / mtab file
echo / sbin / mdev> / proc / sys / kernel / hotplug
Call mdev manager dynamically create plugging device. The above call kernel at each occurrence change in a transmitting apparatus into a user-space application / sbin / mdev to process information corresponding to the operation of the device in further mdev / dev directory, add or delete.
/ sbin / mdev -s
The kernel can automatically create device nodes in the / dev directory
#/bin/hotplug
Hotplug handler is provided mdev core, the core mdev accepts messages from and respond accordingly, such as U disk mount.
# mounting file system specified in /etc/fstab
mkdir -p /dev/pts
mkdir -p /dev/shm
/bin/mount -n -t devpts none /dev/pts -o mode=0622
/bin/mount -n -t tmpfs tmpfs /dev/shm
#/bin/mount -n -t ramfs none /tmp
#/bin/mount -n -t ramfs none /var
Then create the specified folder to mount file systems
mkdir -p / var / empty
mkdir -p / var / log
mkdir -p / var / log / boa
mkdir -p / var / lock
mkdir -p / var / run
mkdir -p / var / tmp
#ln -sf /dev/ttyS2 /dev/tty2
#ln -sf /dev/ttyS2 /dev/tty3
#ln -sf /dev/ttyS2 /dev/tty4
syslogd
Recording a variety of information generated by the system or application, and the information written to the log
/etc/rc.d/init.d/netd start
echo " " > /dev/tty1
echo "Starting networking..." > /dev/tty1
Start the Web Service
#sleep 1
#/etc/rc.d/init.d/httpd start
#echo " " > /dev/tty1
#echo "Starting web server..." > /dev/tty1
#sleep 1
#/etc/rc.d/init.d/leds start
#echo " " > /dev/tty1
#echo "Starting leds service..." > /dev/tty1
#echo " "
#sleep 1
mkdir /mnt/disk
sleep 1
/sbin/ifconfig lo 127.0.0.1
/etc/init.d/ifconfig-eth0
Performing ifconfig-eth0, network configuration