Programming

require 'rubygems'
require 'crontab-parser'

start_time = Time.parse(ARGV[0])
end_time = Time.parse(ARGV[1])

File.open('/root/flagged_cron_jobs.log', 'w+') do |f2|

crontab_data = File.readlines(ARGV[2]).select {|line| line =~ /^[0-9*]/}
cron  = CrontabParser.new(crontab_data.join("\n"))
(start_time..end_time).each do |timestamp|
  next unless timestamp.sec.to_i == 0
  cron.each do |cron_entry|
Dir["/var/spool/cron/*"].each do |file|
  username = file.split("/").last
  crontab = CrontabParser.new(File.read(file))
  puts "User: #{username}"
    if cron_entry.should_run?(timestamp)
      f2.puts "#{timestamp}\t#{cron_entry.cmd}"

        end
      end
    end
  end
end

cron_parse.rb:9:in `readlines': can't convert nil into String (TypeError)
	from cron_parse.rb:9
	from cron_parse.rb:7:in `open'
	from cron_parse.rb:7

ruby cron_parse.rb "Thurs Feb 7 01:00 UTC 2013" "Thurs Feb 7 01:14 UTC 2013"

 crontab = CrontabParser.new(File.read(file))

cron  = CrontabParser.new(crontab_data.join("\n"))

ruby cron_parse.rb "Thurs Feb 7 01:00 UTC 2013" "Thurs Feb 7 01:14 UTC 2013" Filename