I have a task of parsing huge CSV files with multiple entries for same second of date/time. I need to Process the lines for each second and print it out. I need help with parsing part of the CSV. Sample below. 
NAME    6/1/2011    9:30:00    16.76    469898    Q    0
NAME    6/1/2011    9:30:00    16.75    300    Q    0
NAME    6/1/2011    9:30:00    16.75    150    Q    0
NAME    6/1/2011    9:30:01    16.76    756    Q    0
NAME    6/1/2011    9:30:01    16.76    300    Q    0
NAME    6/1/2011    9:30:02    16.76    100    Q    0

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The task is to parse lines and computes values high/low first/last value for column 4 for each second.
I am usign Text::CSV_XS to parse CSV but how to get the time/date value from next line to compare with previous line. 
 while (<FILE>) {
            $csv->parse($_);
            my @columns = $csv->fields();
            $start_time = str2time($columns[1].' '.$columns[2]);
            next unless ($curr_time != $start_time) {
                $exchange = $column[5];
                push (@arr1, $column[3]);
                push (@arr2, $column[4]);
                push (@arr3, $column[5]);
                $curr_time = str2time($columns[1].' '.$columns[2]);
            print "Avg= high= low= in one second=";

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In reply to Parse CSV lines and process for each second by capriguy84

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