How to modify the results in required format?

I have a lookup query as follows | inputlookup hosts.csv | rename hostname as my_hostname | table my_hostname the results are follows abcd abcf.sjs.com GHK ghli.sjd.com How can I modify my query to display the results in the below format for the above results abcd abcf GHK ghli I want to remove the letters after dot in the results and just want to display the words like above