/etc/ssh/ssh\u host\u rsa\u key.pub不是公钥文件

无法检查我的服务器RSA指纹。我做错了什么

$ ls /etc/ssh
moduli       ssh_host_dsa_key    ssh_host_key.pub
ssh_config   ssh_host_dsa_key.pub  ssh_host_rsa_key
sshd_config  ssh_host_key    ssh_host_rsa_key.pub
$ ssh-keygen -lf /etc/ssh/ssh_host_rsa_key.pub 
/etc/ssh/ssh_host_rsa_key.pub is not a public key file.
$ ssh-keygen -lf /etc/ssh/ssh_host_rsa_key
/etc/ssh/ssh_host_rsa_key is not a public key file.

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这是一个文件权限问题

$ cat /etc/ssh/ssh_host_rsa_key.pub 
/etc/ssh/ssh_host_rsa_key.pub: Permission denied