One of the main reasons for Perl's power are it's hashes.

#!/usr/bin/perl
use strict; use warnings;
@ARGV >= 2 or die "2 args mandatory";

my ($base,$compare) = @ARGV;
# always use smaller file as 'base':
#UPDATE: this makes only sense if
#    the name field is unique in both files!
#- thanks to [John M. Dlugosz]
## ($base,$compare) = ($compare,$base)
##   if -s $base > -s $compare;

open my $basefh,'<',$base or die "opening '$base' failed: $!";
my %base = ();
while(<$basefh>){chomp;
   my ($name,@columns) = split;
   $base{$name} = \@columns;
}
close $basefh;

open my $cmpfh,'<',$compare or die "opening '$compare' failed: $!";
while(<$cmpfh>){chomp;

   my ($name,@columns) = split;

   next unless exists $base{$name};
   print "$_ [@{$base{$name}}]\n"
     if $base{$name}[0] == $columns[0];
}
close $cmpfh;
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