The programs normally used in Linux to show routing information is route and netstat. The following is an example of using both programs:

$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.64.64.64     *               255.255.255.255 UH    0      0        0 ppp0
default         *               0.0.0.0         U     0      0        0 ppp0
$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.64.64.64     *               255.255.255.255 UH        0 0          0 ppp0
default         *               0.0.0.0         U         0 0          0 ppp0

It is advisable to include the -n options to both command for faster execution (by not resolving names, and produce slightly different result) as the following;

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.64.64.64     0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0
$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.64.64.64     0.0.0.0         255.255.255.255 UH        0 0          0 ppp0
0.0.0.0         0.0.0.0         0.0.0.0         U         0 0          0 ppp0