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  1. or download this
    $ time perl -lanF, -e 'print join ",", @F[0..14];' numbers.csv > /dev/
+null

real    0m9.880s
user    0m9.716s
sys     0m0.034s
  2. or download this
    $ time perl -lanF, -e 'BEGIN{ $,=","} print @F[0..14];' numbers.csv > 
+/dev/null

real    0m8.974s
user    0m8.772s
sys     0m0.042s
  3. or download this
    $ time perl -ln -e 'print $1 if /((?:[^,]+,){14}[^,]+)/' numbers.csv >
+ /dev/null

...
user    0m3.370s
sys     0m0.031s