[16s]

They are already unique and sorted.

sort -u combo_not.txt | wc -l 6458020

wc -l combo_not.txt 6458020

[biot]

I assume the first line you meant to pipe it through uniq afer the sort? Otherwise the only thing you've demonstrated is that sorting a file doesn't change its line count. :)

[JoshTriplett]

"sort -u" means "sort and uniq".

[biot]

Wow, I can't believe I was never aware of this. Thank you!