Kalanand's February 2010 Log

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February 1st

Scientific Linux 5

To checkout a CMSSW release on SL5 machine (3.4.1 or higher) 
step 1: ssh cmslpc-sl5
step 2: source /uscmst1/prod/sw/cms/cshrc prod 
step 3: setenv SCRAM_ARCH slc5_ia32_gcc434
[optional step: scram list CMSSW 
 This will show which CMSSW versions are available ]
step 4: scram project CMSSW CMSSW_3_4_1
step 5: cd CMSSW_3_4_1/src/
step 6: eval `scram ru -csh`

February 23rd

Merge files utility

To merge several files together: 
edmCopyPickMerge inputFiles=first.root,second.root,third.root outputFile=output.root
To merge several files one can dump the whole list of input files into a text file and then call merge utility: 
edmCopyPickMerge inputFiles_load=listOfInputFiles.txt outputFile=output.root
where listOfInputFiles.txt is a text file containing a list of input files (one file per line).

Important: When giving local files as input, the file names must be prefixed by file:.
For example, first.root would be written file:first.root.

More details here: https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookPickEvents

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Last modified: Thu Apr 22 14:23:41 CST 2010