#use strict;
use FileHandle;

# Global Declaration 
my($spool,%serverdet);

open (spooler ,"data.dat") or  die "Error opening the  file\n";

while($spool=<spooler>) {
    chomp($spool);
    ($server,$dat1,$dat2)=split(/,/,$spool);
    if($serverdet{$server}) {
        $serverdet{$server} .= ";".$dat1.",".$dat2;
    }else{
        $serverdet{$server} = $dat1.",".$dat2;
    }
}

foreach $key (sort keys %serverdet) {
    print "Server $key\n";
    @val = split(/;/,$serverdet{$key});
    foreach $val  (sort @val)    {
     print $val."\n";
    }
}
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Hope this helps!

code tags added by holli