Simon Faulkner <news at titanic.co.uk> wrote in message news:<1lau8vcctfn4g2pi9k5df3km7qgg5r72sv at 4ax.com>... > I have a list of about 5000 numbers in a text file - up to 14 digits > each. > > I need to check for duplicates. > > What would people suggest as a good method? Sort the list, then check whether any 2 consecutive numbers are equal.