Dbugf Print a debug message to stdout.

Errf Print a warning message to stderr.

Fatf Print a fatal message to stderr.

Infof Print an informational message to stdout.

Logf Log a general message, useful for giving the user feedback on progress.

Panf Log a general message, useful for giving the user feedback on progress.

Warnf Print a warning message to stdout.

VerbosityLevel Logging level (default=3); 0=fatal,1=error,2=warning,3=general,4=info,5=debug.

StdLogger Standard logging functions.