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>;
Write a Perl extension module (XS, Inline::C, Swig) to extract the rows.
I like the second option best.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||