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#!/usr/bin/env ruby
# Author: W. David Nash III
# Version 0.1
# August 3, 2009
 
count = 0
STDIN.each do|l|
 
        count += 1
 
        printf("%-3i | ",count)
 
        if !l.match(/^\d+/)
                header = l.to_s.split
        else
 
                (td, data) = l.split(/:/).map
                time = Time.at(td.to_i)
                printf("%s:", time.strftime("%Y-%m-%d %H:%M:%S"))
 
                data.to_s.split.map do |d|
                        if (d.eql? "nan") then d = "0.00" end
                        printf(" | %20.2f", d.chomp)
                end
        end
 
        if(count == 1)
                printf("%20s", "Time")
                header.each do |h|
                        printf(" | %20s",h)
                end
        end
        puts "\n"
end

rrdtool fetch rra/<RRD FILE NAME>.rrd AVERAGE -s -1h -r 60  | ./readRRD.rb

1   |                 Time |   Heap_Mem_Committed |         Heap_Mem_Max |        Heap_Mem_Used | Non_Heap_Mem_Commit |    Non_Heap_Mem_Init |     Non_Heap_Mem_Max |    Non_Heap_Mem_Used |             CPU_TIME |            User_Time |         Thread_Count |    Peak_Thread_Count |        Heap_Mem_Init
2   |
3   | 2009-08-03 13:18:00: |         213295104.00 |         532742144.00 |         130720632.67 |          36405248.00 |          12746752.00 |         100663296.00 |          36383328.00 |         623333333.33 |         531666666.67 |               111.33 |               184.00 |                 0.00
4   | 2009-08-03 13:19:00: |         213295104.00 |         532742144.00 |         132090801.60 |          36405248.00 |          12746752.00 |         100663296.00 |          36383328.00 |        1818000000.00 |        1704000000.00 |               111.80 |               184.00 |                 0.00
5   | 2009-08-03 13:20:00: |         213295104.00 |         532742144.00 |         122721880.67 |          36405248.00 |          12746752.00 |         100663296.00 |          36383328.00 |        2186666666.70 |        2057500000.00 |               112.92 |               184.00 |                 0.00