Preprocessing Data Error

[kleingeo]

I was running the preprocessing script for the LIDC-IDRI data. It went smoothly, until the final call with which said 'cp' is not recognized as an internal or external command. What is the cp call? I didn't come across anything referring to it.

aggregate_meta_info(cf.pp_dir)
subprocess.call('cp {} {}'.format(os.path.join(cf.pp_dir, 'info_df.pickle'), os.path.join(cf.pp_dir, 'info_df_bk.pickle')), shell=True)

Edit: Is cp just the Unix copy command line call?