Array of counters - log file statistics
Collections (Arrays and Hashes) in Ruby example from a Well House Consultants training course
More on Collections (Arrays and Hashes) in Ruby [link]
Source code: amaze4 Module: R107
# This demonstration reads a web access log file and counts
# the number of accesses in each hour in the 24 hour period.
# -------------- Check the file exists and open it
flook = "ac_20090708"
if File.exists? flook
fyle = File.new flook
puts "I don't have that file"
# -------------- Loop through each of the lines of the file
counter = 
all = 0
lyne = fyle.gets
break if lyne.nil?
# ------- 4th space separated field contains date and time
# ------- Within that field, 2nd colon separated element is hour
all = all + 1
stuff = lyne.split(" ")
parts = stuff.split(":")
hour = parts.to_i
# ------- First record for a particular hour - create counter
# ------- then add one to counter
counter[hour] = 0
counter[hour] = counter[hour] + 1
# ------- Report general stats
print "We tested ",all," lines\n"
lines_per_minute = all.to_f / 24.0 / 60.0
print "Busyness was ",lines_per_minute," lines per minute\n"
# ------- Report hour by hour
hour = 0
print "Hour ",hour," accesses ",counter[hour],"\n"
hour = hour + 1
break if counter[hour].nil?
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