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I'd be very surprised if a pure-Perl script beat a native utility like cut.

If cutting out of the columns of these large files is a bottleneck, your options include:

  • As you mentioned, piping the output of cut to your script;
  • Running cut as a pipe from within your script:
    open my $cutter, "-|", 'cut', '-d,', '-f"1-15"', $mongo or die "Fork failed: $!\n"; go_to_town( $_ ) while <$cutter>; close $cutter;
    See perlipc.
  • Write a Perl extension module (XS, Inline::C, Swig) to extract the rows.

I like the second option best.

the lowliest monk


In reply to Re: cut vs split (suggestions) by tlm
in thread cut vs split (suggestions) by sk

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