How to view the DNS address assigned by DHCP?

ifconfig can not show it.

$ ifconfig -a

eth0      Link encap:Ethernet  HWaddr 90:e6:ba:22:6a:f2  

          inet addr:192.168.1.111  Bcast:192.168.1.255  Mask:255.255.255.0

          inet6 addr: fe80::92e6:baff:fe22:6af2/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:224856 errors:0 dropped:0 overruns:0 frame:0

          TX packets:220040 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:166848627 (166.8 MB)  TX bytes:20256333 (20.2 MB)

          Interrupt:46 Base address:0x4000 



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:5889 errors:0 dropped:0 overruns:0 frame:0

          TX packets:5889 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:468885 (468.8 KB)  TX bytes:468885 (468.8 KB)



wlan0     Link encap:Ethernet  HWaddr 00:26:5e:e8:4f:8e  

          BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)