def METHOD_NAME(files, pattern, grep_options, use_colors=True):
    """Call system grep"""
    if not isinstance(files, (list, tuple)):
        files = [files]
    if use_colors:
        grep_options += ["--color=auto"]
    # Make grep output look nicer by 'cd netmiko_full_dir'
    _, netmiko_full_dir = find_netmiko_dir()
    os.chdir(netmiko_full_dir)
    # Convert files to strip off the directory
    retrieve_file = lambda x: x.split("/")[-1]  # noqa
    files = [retrieve_file(a_file) for a_file in files]
    files.sort()
    grep_list = [GREP] + grep_options + [pattern] + files
    proc = subprocess.Popen(grep_list, shell=False)
    proc.communicate()
    return ""