The command dcm extends the functionalities of the dcm GUI for creating and managing catalogues. While the GUI offers quick tools for visiting the tomograms, the dcm command is normally more comfortable for global operations or data extraction.
Creating a catalogue
dcm -create myCatalogue
creates an empty catalogue.
dcm -fromvll myvll
where myvll is a volume list file, in this case a text file with the names of the files
dcm -c <myCatalogue> -at <myTomogram>