/root	d
/root/.ssh	d
/root/.ssh/authorized_keys
!fc	awk '
	BEGIN{ getline key <"/home/ccx/.ssh/id_rsa.pub" } #>
	$0 == key { seen = 1 }
	{ print $0 }
	END { if(!seen) print key }
	'
m600
#/etc/ssh/sshd_config
#!fc	awk '
#	BEGIN{ getline key <"/home/ccx/.ssh/id_rsa.pub" } #>
#	$0 == key { seen = 1 }
#	{ print $0 }
#	END { if(!seen) print key }
#	'
#m600