What command achieves changing the IPv4 address of an interface with minimal typing?

The command that achieves changing the IPv4 address of an interface with minimal typing is "set." In Junos OS, the "set" command is commonly used to configure various settings on network devices, including interface configurations such as IP addresses.

Using "set," you can specify the interface and the desired IP address in a straightforward manner. This command reduces the amount of typing required because it allows for direct modification of specific configuration parameters without needing to rename or modify multiple existing configurations.

In contrast, the other options do not correspond to commands used for changing an IP address in Junos. "Rename" typically refers to changing the name of an object rather than modifying its attributes, while "modify" and "change" are not valid commands in the context of updating configuration parameters in Junos. Thus, "set" is the most efficient and appropriate choice for altering interface IP addresses.