How do i manage networkmanager using text based menu on redhat?

giantpanda

There is a command called nmtui. Network Manager Text User Interface.

The main menu.

# nmtui

You can go straight to the interface configuration as well.

# nmtui edit eth0

An example of what you see. Server mainly use DHCP to get the IP address, it is unlikely you need to edit interfaces this way. This is just to demonstrate the option is there.