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[sk]% time cut -d, -f"1-15" numbers.csv > out.csv
5.670u 0.340s 0:06.27 95.8% 
...
[sk]% time perl -lanF, -e 'print join ",", @F[0..14];' numbers.csv > o
+ut.csv
31.950u 0.200s 0:32.26 99.6%