From the prompt, 
sort data > sorted_data

[download]

Alternatively, the following would be an efficient Perl solution: 

my %grouped;
while (...) {
    my @fields = ...;
    push @{ $grouped{$fields[0]} }, \@fields;
}

for my $group (values %grouped) {
    ...
}

[download]

In reply to Re: a little problem with sorting my data by ikegami
in thread a little problem with sorting my data by aash08

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