1. A method for adapting command line output messages in a virtualized command line interface (CLI) environment, the method comprising: a virtual I/O server CLI (VIOSCLI), receiving a virtualized CLI command; determining if the virtualized CLI command contains an encapsulated guest operating system command having an associated standard output message; in response to determining the virtualized CLI command does not contain an encapsulated guest operating system command, processing a next VIOSCLI entry; in response to determining the virtualized CLI command does contain an encapsulated guest operating system command: executing the virtualized CLI command; responsive to executing the virtualized CLI command, searching for a specified message string within the associated standard output message; and responsive to finding the specified message string, replacing the specified message string with a replacement message string from within a structured array.