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if you set an environment variable, rn, to the run number (i.e. setenv rn <run number>) you can do the following command to start the repipe and have the output in the format expected for the instruction linked to below.
/afs/slac/g/glast/ground/bin/pipeline createStream --stream $rn --define "downlinkID=$rn,runID=$rn" RePipe
More details: Instructions for rolling back a halfPipe stream and susbsequent L1 stream and Reprocessing runs from a RePiped job
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