Shell脚本-修改/etc/hosts文件

vim updateip
#!/bin/bash
update(){
echo "========== 开始更新ip ========="
#1.删除旧的ip
#定义将要删除的旧ip
HOST=`hostname`
echo "本机名称：$HOST"
LINE=`cat /etc/hosts | grep $HOST`
OLDIP=`cat /etc/hosts | grep $HOST | sed 's/hadoop[0-9]\{3\}.*$//g'`
#echo "旧的ip:$LINE"
echo "旧的ip地址:$OLDIP"
#把去除hadoop的映射后的内容写到/tmp/hosts.tmp
grep -v "$LINE" /etc/hosts > /tmp/hosts.tmp
echo "========== 新的ip ========"
#将要添加的新ip
NEWIP=`ifconfig | grep '192.168.88.' | sed 's/^.*inet//g' | sed 's/ *netmask.*$//g' | sed 's/ //g'`
echo "新的ip地址:$NEWIP"
#追加到/tmp/hosts.tmp
#echo "$NEWIP `hostname` `hostname`" >> /tmp/hosts.tmp
if [ "$OLDIP" == "$NEWIP" ]
then
    echo "需要更新"
    #追加到/tmp/hosts.tmp
        echo "$NEWIP `hostname` `hostname`" >> /tmp/hosts.tm
    echo "更新后的host:s"
    cat /tmp/hosts.tmp
else
    echo "不需要更新"
fi
}
#调用方法
uodate