Lets say that you want to take your data file, and create a hash keyed by student name - then a canonical way of doing this might be as follows: 
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my $sdata = 'student.data';
my %students;
open my $infile, '<', $sdata or die "Cannot open $sdata:$!\n";

while (my $line = <$infile>) {
    chomp($line);
    my ($id,$name,$f3,$f4) = $line =~ m/^(\d+)\s(.*)\s(..)\s(..)$/;
    $students{$name}{id} = $id;
    $students{$name}{f3} = $f3;
    $students{$name}{f4} = $f4;
}

close $infile;

print Dumper(\%students);

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The pattern match in the above assumes that the 3rd and 4th fields (not sure what they are) are always just two characters long, and everything between the ID and the 3rd field is the student name. It gives the following output: 
$VAR1 = {
          'Smith Tom' => {
                           'f3' => 'RM',
                           'id' => '777666555',
                           'f4' => 'So'
                         },
          'Johnson Lee' => {
                             'f3' => 'IE',
                             'id' => '555444333',
                             'f4' => 'Sr'
                           },
          'Jones Mary' => {
                            'f3' => 'SD',
                            'id' => '111222333',
                            'f4' => 'Fr'
                          }
        };

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If you wanted to then print a list of students, sorted by say, ID, then you could do something like: 
for my $student (sort {$students{$a}{id} <=> $students{$b}{id}} keys %
+students) {
    print "$student => $students{$student}{id}\n";
}

[download]
Hope this helps,
Darren :)

In reply to Re: Hashes with multiple values? by McDarren
in thread Hashes with multiple values? by MyaEsp

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