setup running env, see here
http://mep.phy.duke.edu/index.php/Computing#jlab_software
#edit compton_geometry.pl to change setup
#create new setup for simulation
./compton.pl config_compton.dat
#run simulation in graphic mode
gemc compton_inter.gcard
#run simulation in batch mode
gemc compton_inter.gcard and refer to "do_it_all.sh"
#scipt for jlab farm job do_it_all.sh exec_sim LongRun_sim FileReduce.C
#analysis result
root[0].x analysis.C+("out.root")