To list the content of directory :

eos ls -ltr /store/user/khurana/

To copy from eos to local directory :

cmsStage /store/user/khurana/rootfile.root localpathtocopy

To copy from loack dir to eos :

xrdcp FourMuonEventsPt200GeV.root root://eoscms.cern.ch///store/user/khurana/HGCAL/GenSim/FourMuon200GeV/FourMuonEventsPt200GeV.root

To create a directory :

eos mkdir  /eos/cms/store/user/khurana/dirname

To remove a directory :

eos rm -r  /eos/cms/store/user/khurana/dirname

In order to add a class in CMSSW you need to keep the .h file in interface and .cc file in the src. Once this is done add one line in the BuildFile.xml :

<use name="HGCAnalyzer/DigiAnalyzer"/>

This is package/sumpackage name where you are keeping your classes.

In addition add following line at the end of the BuildFile.xml

<export>
  <lib   name="1"/>
</export>