def METHOD_NAME(script):
    if script is None or len(script) == 0:
        return None
    cmd = None
    if script == 'iptables':
        cmd = 'iptables-save'
    elif script == 'ipaddr':
        cmd = 'ip address'
    elif script == 'iprule':
        cmd = 'ip rule list'
    elif script == 'iproute':
        cmd = 'ip route show table all'
    else:
        cmd = '/opt/cloud/bin/' + script
        if not os.path.isfile(cmd.split(' ')[0]):
            cmd = None
    return cmd