code: def search_system_path(file_name):
      """Find a file in the system path."""
      for dir in os.environ["path"].split(";"):
          path = os.path.join(dir, file_name)
          if os.path.exists(path):
              return path
  
imports: from optparse import OptionParser
  import os
  import shlex
  import subprocess
  import sys
  import ninja_syntax
label_desc: Use image node_id 7 for calling a global function with example usage: search_system_path(file_name) and returns: path