[root@ceshi . ssh ] # which ssh-copy-id

/usr/bin/which : no  ssh -copy- id  in  ( /usr/local/sbin : /usr/local/bin : /sbin : /bin : /usr/sbin : /usr/bin : /root/bin )

[root@ceshi ~] # ssh-copy-id-i.ssh/id_rsa root@192.168.0.20

- bash :  ssh -copy- id -i. ssh /id_rsa : 没有那个文件或目录

[root@ceshi . ssh ] # ssh-copy-id -i ./id_rsa root@192.168.0.20

ssh : Could not resolve  hostname  . /id_rsa : Name or service not known

[root@puttet ~] # hostname

abc

[root@ceshi . ssh ] # vi /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.0.19 ceshi

192.168.0.20 abc

[root@ceshi . ssh ] # ping abc

PING abc (192.168.0.20) 56(84) bytes of data.

64 bytes from abc (192.168.0.20): icmp_seq=1 ttl=64  time =0.322 ms

64 bytes from abc (192.168.0.20): icmp_seq=2 ttl=64  time =0.270 ms

^C

--- abc  ping  statistics ---

2 packets transmitted, 2 received, 0% packet loss,  time  1300ms

rtt min /avg/max/mdev  = 0.270 /0 .296 /0 .322 /0 .026 ms

[root@ceshi . ssh ] # ssh-copy-id -i ./id_rsa.pub  root@192.168.0.20

The authenticity of host  '192.168.0.20 (192.168.0.20)'  can't be established.

RSA key fingerprint is 7b:a4:ae:42:50:8b:27:82:1c: dc :66:a9:5a:cb:67:a2.

Are you sure you want to  continue  connecting ( yes /no )?  yes

Warning: Permanently added  '192.168.0.20'  (RSA) to the list of known hosts.

root@192.168.0.20's password:

Now try logging into the machine, with  "ssh 'root@192.168.0.20'" , and check  in :

   . ssh /authorized_keys

to  make  sure we haven 't added extra keys that you weren' t expecting.

[root@puttet ~] # cd .ssh/authorized_keys