SSH, The Secure Shell: The Definitive Guide, 2nd Edition

sshd Options

OpenSSH	Tectia	Option	Meaning
✓		-4	Use IPv4 addresses only
✓		-6	Use IPv6 addresses only
✓		-b bits	# of bits in server key
✓		-d	Verbose mode
	✓	-d debug_spec	Enable debug messages
	✓	-D debug_spec	Enable debug messages, keep listening
✓		-D	Don’t detach into background
✓		-e	Send error messages to stderr
✓	✓	-f filename	Use other configuration file
✓	✓	-g time	Set login grace time
✓	✓	-h filename	Use other host key file
✓	✓	-i	Use inetd for invocation
1		-k time	Regeneration interval for SSH-1 server key
✓	✓	-o “keyword value”	Set configuration keyword
✓	✓	-p port	Select TCP port number
✓	✓	-q	Quiet mode
✓		-Q	Quiet if RSA support is missing
✓		-t	Test mode
✓		-u length	Set length of utmp structure
	✓	-v	Verbose mode
	✓	-V	Print version number