/sbin/ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6|awk '{print $2}'|tr -d "addr:"

or

/sbin/ifconfig|sed -n '/inet addr/s/^[^:]*:/([0-9.]/{7,15/}/) .*//1/p'

local_host="`hostname --fqdn`"

local_ip=`host $local_host 2>/dev/null | awk '{print $NF}'`

local_host="`hostname --fqdn`"

nslookup -sil $local_host 2>/dev/null | grep Address: | sed '1d' | sed 's/Address://g'