while (<FILE>) {
    @zapschool = split (/\t/);
    if (m/zaps/i) {
        print NEWFILE "$zapschool[4]\n";        
    }
}

[download]
is slower than 
while (<FILE>) {
    if (m/zaps/i) {
        @zapschool = split(/\t/);
        print NEWFILE "$zapschool[4]\n";        
    }
}

[download]
which can be made more readable as 
while (<FILE>) {
    if (m/zaps/i) {
        my $zapschool = (split(/\t/))[4];
        print NEWFILE "$zapschool\n";        
    }
}

[download]
And the solution is 
my %count;

while (<FILE>) {
    if (m/zaps/i) {
        my $zapschool = (split(/\t/))[4];
        ++$count{$zapschool};
    }
}

foreach (keys(%count)) {
   print NEWFILE "$_: $count{$_}\n";        
}

[download]

In reply to Re: Count and List Items in a List by ikegami
in thread Count and List Items in a List by Tech77

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