ip addr list

alternative to "ifconfig -a". Also useful for showing vrrp interfaces which don't show up in ifconfig.

ifconfig -a fails to show virtual IPs on a linux interface

ip addr list show VIPs

# ip addr list eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
   link/ether 00:0c:29:de:9e:d2 brd ff:ff:ff:ff:ff:ff
   inet 192.168.1.228/28 brd 192.168.1.239 scope global eth0
   inet 10.0.1.4/24 brd 10.0.1.255 scope global eth0   <<< Virtual IP shown here
   inet6 fe80::20c:29ee:fedf:6ff3/64 scope link 
      valid_lft forever preferred_lft forever

ifconfig doesn't....

# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
       inet 192.168.1.228  netmask 255.255.255.240  broadcast 192.168.1.239
       inet6 fe80::20c:29ee:fedf:6ff3 prefixlen 64  scopeid 0x20<link>
       ether 00:0c:29:de:9e:d2  txqueuelen 1000  (Ethernet)
       RX packets 15548862  bytes 3392638504 (3.1 GiB)
       RX errors 23  dropped 100  overruns 0  frame 0
       TX packets 14524112  bytes 3246930184 (3.0 GiB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
       device interrupt 18  base 0x2000