#!/bin/sed -nf
#< get ip addresses from file
# usage ./iplist.sed /etc/hosts
# ignores commented ips, etc

/^[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*.*/ {
   s/\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*/\1/g
   p
}