Help-a small script

Help-a small script-General Linux technology-Linux programming and kernel information. The following is a detailed description. The younger brother wants to get a script to automatically import the ip host name to/etc/hosts.
My script content is as follows:
Ifconfig eth0 | grep "inet addr" | cut-d:-f 2 | cut-d ""-f 1>/etc/hosts
Hostname>/etc/hosts

There are two rows, but after importing/etc/hosts, it should be one row, but now it is two rows
How can I write and import the hosts content to make it look normal?

192.168.1.20 dxna <--- This is normal. the IP address has several spaces in the middle of the front host name.


192.168.1.20 <-- This is what my script imports. it turns out two lines are depressing.
Dxna