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.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|