Command line filter that only prints unique lines
License: MIT License
Thanks for the utility, it was very useful.
However when I'm comparing the performance with awk script, it's slower.
awk$ seq 20000000 | time awk '!a[$0]++{print}' | pv -l >/dev/null
22.67user 0.87system 0:23.55elapsed 99%CPU (0avgtext+0avgdata 1616164maxresident)
0inputs+0outputs (0major+403562minor)pagefaults 0swaps
20.0M 0:00:23 [ 849k/s]
unique$ seq 20000000 | time unique | pv -l >/dev/null
19.68user 10.32system 0:29.74elapsed 100%CPU (0avgtext+0avgdata 860364maxresident)
0inputs+0outputs (0major+224737minor)pagefaults 0swaps
20.0M 0:00:29 [ 672k/s]
awk$ echo | pee "seq 10000000" "seq 10000000" "seq 10000000" | time awk '!a[$0]++{print}' | pv -l | wc -l
14.37user 0.64system 0:15.02elapsed 99%CPU (0avgtext+0avgdata 825032maxresident)
0inputs+0outputs (0major+205782minor)pagefaults 0swaps
10.0M 0:00:15 [ 665k/s]
10000522
unique$ echo | pee "seq 10000000" "seq 10000000" "seq 10000000" | time unique | pv -l | wc -l
12.67user 5.49system 0:18.02elapsed 100%CPU (0avgtext+0avgdata 431976maxresident)
0inputs+0outputs (0major+115640minor)pagefaults 0swaps
10.0M 0:00:18 [ 554k/s]
10000216
Why the performance is slower than the scripting language?
Are there any methods of improving the performance?
The only plus is that it's using much less memory.
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