At this point you sould have an lxplus account at CERN

• The first thing is to check out a version of the CMS SoftWare (CMSSW) by using the command:
  
  scramv1 project CMSSW CMSSW_1_6_8
  NOTE: This should be in the directory were you want to keep this version of CMSSW
  
  
  
• Now we need to check out some libaries from the CVS to generate the events
  
  eval `scramv1 runtime -csh`
  cd CMSSW_1_6_8/src
  cmscvsroot CMSSW
  cvs login
  
  Password is : 98passwd
  
  
• Now choose the libary to check out in this case:
  
  cvs co -r CMSSW_1_6_8 FastSimulation
  
  
• We have the libaries we need, now generate some events
  Going to :
  
  ~/CMSSW_1_6_8/src/FastSimulation/Configuration/test/Example.cfg
  
  Edit this file to make sure that the line that sends the output to a .root file is uncommented
  Example.cfg
  
  
• To create the events :
  
  cmsRun Example.cgf &
  
  
• At this point you should have a .root file with your generated events, now to analyze the events
  Create a directory were you will keep your analyzer
  
  cd
  cd CMSSW_1_6_8/src
  mkdir myanalyzer
  cd myanallyzer
  
  
• Now to get the skeleton code of the analyzer:
  
  mkedanlzr Myanalyzer
  cd Myanalyzer/src
  
  
• Here should be a the file Myanalyzer.cc, this is just a skeleton libraries need to be added
  and the actual analysis code needs to be created as well as the histograms output (.root) files,
  follow the example
  Myanalyzer.cc
  
  
• Now edit the myanalyzer.cfg file, to give it right path to the generated data, should be
  under test, follow the example, make sure you give it the complete path
  myanalyzer.cfg
  
  
• Now add the pertinent libaries to the Build file:
  
  cd ..
  ls
  
  Edit the BuildFile, use the following example,
  BuildFile
  
  
• At this point reset you environment, make sure that when you type ls you can
  "see" the BuildFile
  
  eval `scramv1 runtime -csh`
  
  
• To Compile use
  
  scramv1 b
  
  
• Now run you analysis code
  
  cmsRun test/myanalyzer.cfg >& output.txt&
  
  
• Now you should have a .root file with your histograms
  
  root -l
  root[0] TFile* file = TFile::Open("******.root")
  root[1] .ls
  
  At this point you should see your histograms
  NOTE: The ****** is the name you gave to your .root file when editing Myanalyzer.cc