FlagErrorf returns a new FlagError that wraps an error produced by fmt.Errorf(format, args...).

FlagError returns a new FlagError that wraps the specified error.

NewIOStreams initializes IOStreams with default terminal settings.

user-initiated cancellation.

nothing failed but something is pending.

triggers exit code 1 without any error messaging.

A *FlagError indicates an error processing command-line flags or other arguments.