Fatal terminates a program with a specific exit code and zero or more messages.

Fatalf terminates a program with a specific exit code and zero or more messages formatted using a format string that's sent to the log and stderr.

ReadDirectoryFlagValue tests whether the specified string refers to a directory.

ReadFileFlagValue tests whether the specified string refers to a file.

ReadRequiredFlagBaseURLValue returns the value of a required base URL flag.

ReadRequiredFlagBoolValue returns the value of a required bool flag.

ReadRequiredFlagNonNegativeIntValue returns the value of a required int flag.

ReadRequiredFlagStringValue returns the value of a required string flag.

ReadStringCollectionValue returns the value of a string collection flag.

ReadStringCollectionWithSeparatorValue returns the value of a string collection flag.

ReadTextFileFlagValue returns the string in the specified file flag value.

SetLogger sets the output destination for the standard logger to the specified file flag value.