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ifconfig

Unix-like operating system command
ifconfig is a system administration utility in Unix-like operating systems for network interface configuration. The utility is a command-line interface tool and is also used in the system startup scripts of many operating systems. Wikipedia
Example: ifconfig fxp0 inet 192.168.1.10 netmask 255.255.255.0
Syntax: ifconfig -AaC interface address_family address dest_address parameters
Alternative: The ip command
Initial release: August 1983; 40 years ago
Operating system: Unix and Unix-like