Once I've found this somewhere. It worked for me. "For alpha sort, select the lines to be sorted and hit F5. This option ignores capitalization. Hitting Control F5 will sort lines starting with capital letters first, then alphabetize lines starting with lowercase letters."
"The Permute Lines menu options provide a few more ways to sort, including Reverse, which sorts in reverse alpha order, starting with lowercase letters, Unique, which removes duplicated lines, and Shuffle, which sorta kinda randomizes the text."
Hope this helps.. :)
I think General Redneck's screenshot will help. So I am adding it:
In v2.0.2 on Windows and Ubuntu shortcut is F9.