master-server/deps/curl/docs/cmdline-opts/krb.md

c	SPDX-License-Identifier	Long	Arg	Help	Protocols	Requires	Category	Added	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	krb	<level>	Enable Kerberos with security <level>	FTP	Kerberos	ftp	7.3	single	delegation ssl	--krb clear ftp://example.com/

--krb

Enable Kerberos authentication and use. The level must be entered and should be one of 'clear', 'safe', 'confidential', or 'private'. Should you use a level that is not one of these, 'private' is used.