[OT SED AWK GREP] How to remove matching lines?

Howdy, I have a file that's a list of hostnames from 2 different apache servers. I'd like to get rid of all duplicates with sed or awk. for example after combining the two lists and running sort on it I get the following: abc.com asdf.net asdf.net qwerty.org sdfg.net sdfg.net I want to get rid of all duplicates, such as "asdf.net" and "sdfg.net" in this example. can this be done? ---------------------------------------------------- Jonathan Wilson System Administrator Cedar Creek Software http://www.cedarcreeksoftware.com Central Texas IT http://www.centraltexasit.com