获得linux的IP地址信息

这段shell脚本主要用来获得Linux的IP地址信息，包括IP、网关、子网掩码、广播地址以及DNS，参考了Eucalyptus中的eucalyptus-ipaddr.conf文件。

default_route=$(ip route show)
default_interface=$(echo $default_route | sed -e 's/^.*dev \([^ ]*\).*$/\1/' | head -n 1)
address=$(ip addr show label $default_interface scope global | awk '$1 == "inet" { print $2,$4}')

#ip address
ip=$(echo $address | awk '{print $1 }')
ip=${ip%%/*}

#broadcast
broadcast=$(echo $address | awk '{print $2 }')

#mask address
mask=$(route -n |grep 'U[ \t]' | head -n 1 | awk '{print $3}')

#gateway address
gateway=$(route -n | grep 'UG[ \t]' | awk '{print $2}')

#dns
dns=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}')

echo ip:$ip,mask:$mask,broadcast:$broadcast,gateway:$gateway,dns:$dns

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来源：http://www.cnblogs.com/flyingzl/articles/2119966.html