code: def getpcmd(pid):
      
      if os.name == "nt":
          # Use wmic command instead of ps on Windows.
          cmd = 'wmic path win32_process where ProcessID=%s get Commandline 2> nul' % (pid, )
          with os.popen(cmd, 'r') as p:
              lines = [line for line in p.readlines() if line.strip("\r\n ") != ""]
              if lines:
                  _, val = lines
                  return val
      elif sys.platform == "darwin":
          # Use pgrep instead of /proc on macOS.
          pidfile = ".%d.pid" % (pid, )
          with open(pidfile, 'w') as f:
              f.write(str(pid))
          try:
              p = Popen(['pgrep', '-lf', '-F', pidfile], stdout=PIPE)
              stdout, _ = p.communicate()
              line = stdout.decode('utf8').strip()
              if line:
                  _, scmd = line.split(' ', 1)
                  return scmd
          finally:
              os.unlink(pidfile)
      else:
          # Use the /proc filesystem
          # At least on android there have been some issues with not all
          # process infos being readable. In these cases using the `ps` command
          # worked. See the pull request at
          # https://github.com/spotify/luigi/pull/1876
          try:
              with open('/proc/{0}/cmdline'.format(pid), 'r') as fh:
                  if six.PY3:
                      return fh.read().replace('\0', ' ').rstrip()
                  else:
                      return fh.read().replace('\0', ' ').decode('utf8').rstrip()
          except IOError:
              # the system may not allow reading the command line
              # of a process owned by another user
              pass
  
      # Fallback instead of None, for e.g. Cygwin where -o is an "unknown option" for the ps command:
      return '[PROCESS_WITH_PID={}]'.format(pid)
docs: Returns command of process.
  
      :param pid: