Removing duplicate rows in vi?

Question

I have a text file that contains a long list of entries (one on each line). Some of these are duplicates, and I would like to know if it is possible (and if so, how) to remove

Answer 1

I would combine two of the answers above:

go to head of file
sort the whole file
remove duplicate entries with uniq

1G
!Gsort
1G
!Guniq

If you were interested in seeing how many duplicate lines were removed, use control-G before and after to check on the number of lines present in your buffer.