AsError asserts that err is either nil or of type Error and returns it.

Die prints a non-nil err to io.Stderr and returns an error of type Error or nil.

ExitCommandArguments indicates that the user attempted to pass invalid command-specific arguments to a subcommand.

ExitContext indicates an error with the underlying command context.

ExitGeneralArguments indicates that the user attempted to pass invalid general arguments to the program.

ExitGeneric indicates a generic error occurred within this invocation.

ExitPanic indicates that the go code called panic() inside the execution of the current program.

ExitUnknownCommand indicates that the user attempted to call a subcommand that is not defined.

ExitZero indicates that no error occurred.

Error represents any error state by a program.

ExitCode determines the exit behavior of a program.