ip address 10.20.0.1 255.255.224.0 ^ Error: Unrecognized command found at '^' position.

It seems like you might be trying to enter this command in a switch or router CLI environment.

If this is the case, you need to enter configuration mode first before you can configure an interface with an IP address. You can do this by entering the following commands:

enable
configure terminal

Once you're in configuration mode, you can enter the interface configuration commands to configure an IP address on an interface. For example, to configure an IP address of 10.20.0.1 with a subnet mask of 255.255.224.0 on interface GigabitEthernet0/1, you would enter the following commands:

interface GigabitEthernet0/1
ip address 10.20.0.1 255.255.224.0

Make sure to replace "GigabitEthernet0/1" with the actual name of the interface you want to configure.

I hope that helps! Let me know if you have any more questions.