Say you make some temporary changes to your network configuration in CentOS 7. For example, assigning an IP address to an interface:
ip addr add 10.12.23.42/24 dev ens192u1
In order for the above change to become permanent it needs to be written to file at
Rather than creating this file manually, you can automatically generate it from the current network configuration (including your temporary changes).
nmtui (as root), select “Edit a connection”, select your connection, then without making any changes select “OK” and then quit. It will have generated the
ifcfg-ens192u1 file for you if it did not exist already.