code: def cmd_copy():
      
      db = connect()
  
      if args.force and db_exists(db, args.dest):
          tmp_db = generate_alt_dbname(db, args.dest, 'tmp')
          pg_copy(db, args.src, tmp_db)
  
          pg_move_extended(db, tmp_db, args.dest)
  
      else:
          pg_copy(db, args.src, args.dest)
docs: Uses CREATE DATABASE ... TEMPLATE to create a duplicate of a database. Additionally copies over database-specific
      settings.
  
      When used with --force, an existing database with the same name as DEST is replaced, the original is renamed out of
      place in the form DEST_old_YYYYMMDD (unless --no-backup is specified).