Execution was interrupted by SIGINT (e.g. Ctrl-C).
Arguments were successfully parsed but no command was discovered.
The arguments supplied were invalid or could not be parsed.
General runtime error related to the framework.
Arguments were successfully parsed and the specified command(s) were successfully executed.
Execution was terminated by a signal other than SIGINT (e.g. SIGTERM).
Arguments were successfully parsed and command(s) discovered but command execution failed.