Which short command to only output the IPv4 routing table?
$ netstat -nr -f inet
Routing tables

Internet:
Destination        Gateway            Flags        Refs      Use   Netif Expire
default            192.168.1.254      UGSc           10        0     en4
default            10.0.2.1           UGScI           0        0    ppp0
10                 ppp0               USc             0        0    ppp0