Removes keys older than X days

redis_remove_keys_older_than_x_days.rb

#!/usr/bin/env ruby
require 'redis'

pattern = ARGV[1] || "*"
days = ARGV[0].to_i > 0 ? ARGV[0].to_i : 30
MAX_AGE = days * 60 * 60 * 24 # convert to seconds
redis = Redis.new
cursor = 0
loop do
  cursor, keys  = redis.scan cursor, :match => pattern
  keys.each do |key|
    idle_time = redis.object('idletime', "#{key}").to_i
    if idle_time > MAX_AGE
      puts "Deleting key #{key} with idle time of #{idle_time} which is older than #{MAX_AGE}"
      redis.unlink key
    end
  end
  break if cursor == '0'
end