Linux (mac) ssh cannot generate key error handling

/Etc/ssh/ssh_host_dsa_key. I don't have this file. all the items are in front of the more/etc/ssh/sshd_config file. # try to change it, and restart inetd is invalid. it seems that most of the users do not want to automatically generate the file before the configuration problem. if it fails, check the manual % ssh-keygen-tdsa and press enter, by default, a key pair is stored in ~ /. Ssh/id_dsa # cp ~

/Etc/ssh/ssh_host_dsa_key. I don't have this file.

More/etc/ssh/sshd_config #
Try to change the value and restart inetd.
It does not seem that most users have configuration problems.
I want to automatically generate this file before, but failed.

I checked the manual again.
% Ssh-keygen-t dsa
Press Enter. by default, a key pair is placed ~ /. Ssh/id_dsa
# Cp ~ /. Ssh/id_dsa/etc/ssh/ssh_host_dsa_key
Inetd-HUP
Try again, OK