Hello, another way (more suitable for a beginner?) to do it:

#!/usr/bin/perl
use strict;
use warnings;

# Get the filename as command line argument
my $filename = shift;

open my $fh, "<", $filename or die "Can't open $filename";
while ( my $line = <$fh> ) {    # go through file, line by line
    my @fields = split ':', $line;
    my ($first) = split /\s+/, $fields[4];
    print "$first\n";
}
close $fh;
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