Permute

Shuffles lines, reverses lines, and removes duplicates, if that's the sort of thing you are into.

Shuffle

Edit -> Lines -> Permute -> Shuffle

Will shuffle either the whole file or your current selection

Unique

Edit -> Lines -> Permute -> Unique

Will filter out the duplicates of either the whole file or your current selection

Reverse

Edit -> Lines -> Permute -> Reverse

Will reverse either the whole file or your current selection