FileExists reports whether the named file or directory exists.

NewAmountFlag creates an AmountFlag with a default czzutil.Amount.

NewExplicitString creates a string flag with the provided default value.

NormalizeAddress returns the normalized form of the address, adding a default port if necessary.

NormalizeAddresses returns a new slice with all the passed peer addresses normalized with the given default port, and all duplicates removed.

AmountFlag embeds a czzutil.Amount and implements the flags.Marshaler and Unmarshaler interfaces so it can be used as a config struct field.

ExplicitString is a string value implementing the flags.Marshaler and flags.Unmarshaler interfaces so it may be used as a config struct field.