Usage:  rfkill [options] command
Options:
    --version   show version (0.5-1ubuntu3.1 (Ubuntu))
Commands:
    help
    event
    list [IDENTIFIER]
    block IDENTIFIER
    unblock IDENTIFIER
where IDENTIFIER is the index no. of an rfkill switch or one of:
    <idx> all wifi wlan bluetooth uwb ultrawideband wimax wwan gps fm nfc