code: def run():
      """Run command."""
      from mne.commands.utils import get_optparser
  
      parser = get_optparser(__file__)
  
      subject = os.environ.get("SUBJECT")
      subjects_dir = get_subjects_dir()
      if subjects_dir is not None:
          subjects_dir = str(subjects_dir)
  
      parser.add_option(
          "-s",
          "--subject",
          dest="subject",
          help="Subject name",
          default=subject,
      )
      parser.add_option(
          "-d",
          "--subjects-dir",
          dest="subjects_dir",
          help="Subjects directory",
          default=subjects_dir,
      )
      parser.add_option(
          "-m",
          "--method",
          dest="method",
          help=(
              "Method used to generate the BEM model. "
              "Can be flash or watershed."
          ),
      )
  
      options, args = parser.parse_args()
  
      subject = options.subject
      subjects_dir = options.subjects_dir
      method = options.method
  
      freeview_bem_surfaces(subject, subjects_dir, method)
  
imports: import os
  import os.path
  import sys
  import mne
  from mne.utils import get_subjects_dir, run_subprocess
label_desc: Use image node_id 2 for calling a global function with example usage: run() without return types