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Some of the slowness appears to be related to the split, rather than the join. On my system, this takes about 9s:
$ time perl -lanF, -e 'print join ",", @F[0..14];' numbers.csv > /dev/ +null real 0m9.880s user 0m9.716s sys 0m0.034s
and your version takes a little less:
$ time perl -lanF, -e 'BEGIN{ $,=","} print @F[0..14];' numbers.csv > +/dev/null real 0m8.974s user 0m8.772s sys 0m0.042s
but this one avoiding both -a and join only takes about 3.4s:
$ time perl -ln -e 'print $1 if /((?:[^,]+,){14}[^,]+)/' numbers.csv > + /dev/null real 0m3.412s user 0m3.370s sys 0m0.031s

In reply to Re^2: cut vs split (suggestions) by dave0
in thread cut vs split (suggestions) by sk

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