If the duplicate records will always be grouped together, you could do something like the following to keep track of the last record you've seen. I'm assuming that the first column is the key you care about. If you really care about the first 3 columns, you'll have to modify accordingly.
use strict; use warnings;
my $last = '';
while(<>)
{
my @columns = split;
next if $columns[0] eq $last;
$last = $columns[0];
print;
}
If the duplicate records don't necessarily follow each other, then use a hash to determine which ones you've already seen.
use strict; use warnings;
my %seen;
while (<>)
{
my @columns = split;
next if exists $seen{$columns[0]};
$seen{$columns[0]} = 1;
print;
}
-
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.
|