The general procedure is to first read the file that contains the interesting mapping, read the mapping into a hash, and then traverse the second file and do the transformation of these lines based on the hash.

Something like this:

use 5.010;
use strict;
use warnings;
use autodie;

my %map;
open my $IN, '<', 'f1';
while (<$IN>) {
    my ($first, undef, $type, $fourth) = split;
    $map{$fourth} = $first if $type eq 'coord';
}
close $IN;

open $IN, '<', 'f2';
while (<$IN>) {
    my ($first, $rest) = split /\s/, $_, 2;
    if ($map{$first}) {
        print "not_$map{$first} $rest"
    }
}
close $IN;

[download]

Note that the variable names are quite terrible, because I don't know what the values stand for.

Perl 6 - second systems done right

In reply to Re: Select only desired features from a text by moritz
in thread Select only desired features from a text by remluvr

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