Usage: 
			python enhancedRRDTest.py [create|update|plot|dump] [options]
			Note: plotall has been replaced by 'plot -a'
			Example1:
				python enhancedRRDTest.py create -d test.rrd --step 250
				while doing the bwctl test:
					cat bwctloutput | python enhancedRRDTest.py update -d test.rrd
				python enhancedRRDTest.py plot -d test.rrd -t lastweek
			Example2: Dump from a mysqldb. (customized by conf.py)
				python enhancedRRDTest.py dump -p tcp
				python enhancedRRDTest.py plot -t lastday
				python enhancedRRDTest.py plot -a --start 1313000000 --end 1313130000
			

Options:
  -h, --help            show this help message and exit
  -d DBNAME, --database=DBNAME
                        Specify a name for the rrd db.  [default=test.rrd]
  -s STEP, --step=STEP  Specify the step length For <create>    [default=1000]
  -b START, --start=START
                        start time to plot. default is 50000 sec before now
                        [default=-500000]
  -e END, --end=END     end time to plot. default is NOW        [default=N]
  -t INTERVAL, --from=INTERVAL
                        for <plot>. most helpful time interval selection.e.g.
                        -t lastmonth see or change choices in conf.py
  -p PROTOCOL, --protocol=PROTOCOL
                        For <dump> tcp or udp?  [default=tcp]
  -a, --all             if set, when plot or update, do for all. Based on
                        permutation on hosts.
  -m, --mysql           When get the output, also update mysqldb
  -v, --verbose         
  

Case Study1:
Suppose 
	1. You wanna replace the current scripts with chen's suite.
	2. You already have a mysql database (actually same entries)

You need: enhancedRRDTest.py conf.py updater.py record.py README

Step1: dump things from the existed database
	run: python enhancedRRDTest.py dump -t tcp
	run: python enhancedRRDTest.py dump -t udp
	Note: the tcp rrd db will end with 'tcp.rrd', vice versa
		  So things won't be messed.
		  rrd names are based on permutations of hosts

Step2: use chen's scripts to take over the bwctl job
	put the below 2 lines in cron
	python enhancedRRDTest.py update -m -a -p tcp
	python enhancedRRDTest.py update -m -a -p udp
	Note: this will run bwctl command based on _bwc in conf.py
		  (permutation involved to test all the lines) and then
		  (-m) update mysql db for you. (-a) update all the  
		  corresponding rrd dbs.

Step3: use chen's script to plot pictures periotically
	based your period in cron (see RRA choices in conf.py)
	python enhancedRRDTest.py plot -a -p tcp -t [lasthour|lastday|..]
	python enhancedRRDTest.py plot -a -p tcp -t [lasthour|lastday|..]


Hint: how to fake the end(NOW) when plotting
	python enhancedRRDTest.py plot -e lastweek -t lastmonth