# ifconfig --help
ifconfig: illegal option -- -
usage: ifconfig [-h] [-m] [-v] [-z] [-L] interface
        [ af [ address [ dest_addr ] ] [ netmask mask ] [ prefixlen n ]
                [ alias | -alias ] ]
        [ up ] [ down ] [ metric n ] [ mtu n ]
        [ nwid network_id ] [ nwkey network_key | -nwkey ]
        [ powersave | -powersave ] [ powersavesleep duration ]
        [ hidessid | -hidessid ] [ apbridge | -apbridge ]
        [ [ af ] tunnel src_addr dest_addr ] [ deletetunnel ]
        [ arp | -arp ]
        [ media type ] [ mediaopt opts ] [ -mediaopt opts ] [ instance minst ]
        [ preference n ]
        [ vlan n vlanif i ]
        [ agrport i ] [ -agrport i ]
        [ anycast | -anycast ] [ deprecated | -deprecated ]
        [ tentative | -tentative ] [ pltime n ] [ vltime n ] [ eui64 ]
        [ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ]
       ifconfig -a [-b] [-h] [-m] [-d] [-u] [-v] [-z] [ af ]
       ifconfig -l [-b] [-d] [-u] [-s]
       ifconfig -C
       ifconfig interface create
       ifconfig interface destroy
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