COPY - Ignore Problems

I wish to insert data into a table from a very large text file (from a
cron script) using COPY. However if the lName (TEXT), fName(TEXT),
workDate(DATE) already exist I don't want to insert data and just want
to move onto the next record. Is there any way I can tell my bash
script/COPY to ignore the case where the unique constraint exists
(lName,fName,workDate), and move on to the next record?

ps 7.4, debian stable
TIA
Ron