Shell脚本获取Linux的唯一序列号

思路如下：

1. 获取硬盘序列号，获得三次，都不为空并且一致才使用
2. 如果成立，则令diskSn等于此结果，如果不成立，获取所在分区的UUID
3. 同样三次不为空且一致使diskSn等于此结果
4. 都不成立则获取Linux的MacAddress

其中
获取硬盘序列号为：dmidecode -s system-serial-number
获取uuid为：blkid | awk ‘NR==1’ | awk ‘{print $2}’

获取mac地址为：ip addr | grep “link/ether” | awk ‘NR==1’ | awk ‘{print $2}’
shell脚本如下：shell。

// An highlighted block
#!/bin/bash
echo "Content-Type:text/html\n\n"
serialNum=null
sn=null
uuid=null
mac=null
diskRun(){
        s1=`dmidecode -s system-serial-number`
        sn=`echo ${s1#*-} | sed s/[[:space:]]//g | sed 's/-//g' | tr [:lower:] [:upper:]`
}
uuidRun(){
       	 uu1=`blkid | awk 'NR==1' | awk '{print $2}'`
	uuid=`echo ${uu1##*=} | sed 's/\"//g' | sed 's/-//g' | tr [:lower:] [:upper:]`
}
macAddrRun(){
		mac=`ip addr | grep "link/ether" | awk 'NR==1' | awk '{print $2}' |  sed 's/://g'`
}
disk(){
        diskRun
        sn1=$sn
        diskRun
        sn2=$sn
        diskRun
        sn3=$sn
        if [ $sn1 -a $sn2 = $sn1 -a $sn3 = $sn1 ]
        then
                serialNum=$sn1
                return 1
        fi
}
uuidMac(){
                uuidRun
                uuid1=$uuid
                uuidRun
                uuid2=$uuid
                uuidRun
                uuid3=$uuid
                if [ $uuid1 -a $uuid2 = $uuid1 -a $uuid3 = $uuid1 ]
                then
                                serialNum=$uuid1
                                return 1
                else
                                macAddrRun
                                macaddr=$mac
                                serialNum=$macaddr
                                return 1
                fi
}
disk
if [ $? = 1 ]
then 
	echo $serialNum
fi
if [ $serialNum = null ]
then
        uuidMac
        if [ $? = 1 ]
		then 
			echo $serialNum
		fi
fi