# Example Commands¶

The loopdb_builder utility program is run by specifying a directory containg PDB files and a name of the source of the data

prompt> loopdb_builder -in PDB_DIR -source_name RCSB -prefix rcsb


Here, loopdb_builder will build a database of the loops in the structures provided in the directory. The resulting file will be named rcsb_spruce.loop_db.