（176）以下是 sd_fusing_exynos4x12.sh 的完整内容，笔记漏掉了一部分，修改后保存不当，不再重复整理了 ：
bash
#!/bin/sh
#
# Copyright (C) 2010 Samsung Electronics Co., Ltd.
# http://www.samsung.com/
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
####################################
reader_type1="/dev/sd"
reader_type2="/dev/mmcblk0"
if [ -z $2 ]
then
echo "usage: ./sd_fusing.sh <SD Reader's device file> <filename>"
exit 0
fi
param1=`echo "$1" | awk '{print substr($1,1,7)}'`
#
#$1 值为/dev/sdb，echo打印该字符串通过管道|传递给awk
#awk 提取输入的字符串的第一个字符串，并调用命令print打印substr()执行结果
#substr提取字符串$1 中 1-7个字符串，即/dev/sd
if [ "$param1" = "$reader_type1" ]
then
partition1=$1"1"
partition2=$1"2"
partition3=$1"3"
partition4=$1"4"
#对应分区 partition1 /dev/sdb1 ,以此类推
elif [ "$1" = "$reader_type2" ]
then
partition1=$1"p1"
partition2=$1"p2"
partition3=$1"p3"
partition4=$1"p4"
else
echo "Unsupported SD reader"
exit 0
fi
if [ -b $1 ]
#判断是否为真
then
echo "$1 reader is identified."
else
echo "$1 is NOT identified."
exit 0
fi
####################################
# format
umount $partition1 2> /dev/null
umount $partition2 2> /dev/null
umount $partition3 2> /dev/null
umount $partition4 2> /dev/null
echo "$2 fusing..."
dd iflag=dsync oflag=dsync if=$2 of=$1 seek=1 && \
echo "$2 image has been fused successfully."
#echo "zImage fusing..."
#dd iflag=dsync oflag=dsync if=../../TC4_Kernel_3.0/arch/arm/boot/zImage of=$1 seek=1024 && \
# echo "zImage has been fused successfully."
#echo "ramdisk-uboot.img fusing..."
#dd iflag=dsync oflag=dsync if=../../TC4_GB_2.3.4/out/target/product/smdk4212/ramdisk-uboot.img of=$1 seek=9216 && \
# echo "ramdisk-uboot.img has been fused successfully."
####################################
#<Message Display>
echo "Eject SD card"（177）
++ 至此，老师带着讲解完了这个重要的 shell 脚本。
（178）
（179）
（180）
谢谢