Question

我有一个dns＆amp;我们公司的apachi服务器，它的IP地址是动态的我试图做以下事情：

＆＃13;

#!/bin/bash
# Get the dynamic IP (dirty, I know)
IP=`host -t a mychangingip.myip.com | perl -nle '/((?:\d+\.?){4})/ && print $1' | head -n1`
# Update the hosts file
if test -n "$IP"; then
    grep -v www.thesite.com /etc/hosts > /tmp/hosts
    echo "$IP www.thesite.com" >> /tmp/hosts
    cp /tmp/hosts /etc/hosts
fi

＆＃13;

到目前为止这一步工作正常，但是当我尝试：

＆＃13;

#!/bin/bash
# Get the dynamic IP (dirty, I know)
IP=`host -t a mychangingip.myip.com | perl -nle '/((?:\d+\.?){4})/ && print $1' | head -n1`
# Update the hosts file
if test -n "$IP"; then
    grep -v www.thesite.com /etc/hosts > /tmp/hosts
    grep -v portal.thesite.com /etc/hosts > /tmp/hosts
    echo "$IP www.thesite.com" >> /tmp/hosts/
    echo "$IP portal.thesite.com" >> /tmp/hosts
    cp /tmp/hosts /etc/hosts
fi

＆＃13;

它没有按预期工作，只更新了一个条目

Answer 1

替换：

grep -v www.thesite.com /etc/hosts > /tmp/hosts
grep -v portal.thesite.com /etc/hosts > /tmp/hosts

使用：

grep -v www.thesite.com /etc/hosts > /tmp/hosts2
grep -v portal.thesite.com /etc/hosts2 > /tmp/hosts

或，用以下内容替换两行：

grep -v 'www.thesite.com\|portal.thesite.com' /etc/hosts > /tmp/hosts

进一步简化

考虑更换这五行：

grep -v www.thesite.com /etc/hosts > /tmp/hosts
grep -v portal.thesite.com /etc/hosts > /tmp/hosts
echo "$IP www.thesite.com" >> /tmp/hosts/
echo "$IP portal.thesite.com" >> /tmp/hosts
cp /tmp/hosts /etc/hosts

这一行：

sed -i.bak "/www.thesite.com|portal.thesite.com/ s/[^[[:space:]]*/$IP/" /etc/hosts

Answer 2

供您参考：

grep -v 'www.thesite.com' /etc/hosts|grep -v 'portal.thesite.com' >/tmp/hosts
echo -e $IP'\t\t'www.thesite.com >> /tmp/hosts
echo -e $IP'\t\t'portal.thesite.com >> /tmp/hosts
cat /tmp/hosts > /etc/hosts

获取动态IP然后Grep＆amp; Echo Hosts文件

2 个答案:

进一步简化