C:\test>perl -E"say int( rand 100 ) for 1 .. 10e6" > 10e6(of100).dat

C:\test>timeit \perl64\bin\sort.exe -u -o sorted "10e6(of100).dat"
Took: 70.141548560 seconds

C:\test>timeit \perl64\bin\sort.exe -o sorted "10e6(of100).dat"
Took: 87.626558680 seconds