| 
SSH1 | 
SSH2 | 
OpenSSH | 
Option | 
Meaning | 
|   | 
  | 
  | 
-1 | 
Limit SSH1 compatibility | 
  | 
  | 
  | 
-d | 
Unload key | 
  | 
  | 
  | 
-D | 
Unload all keys | 
|   | 
  | 
  | 
-f step | 
Limit agent-forwarding hops | 
|   | 
  | 
  | 
-F host_list | 
Limit agent-forwarding hosts | 
|   | 
  | 
  | 
-I | 
PGP keys are identified by ID | 
  | 
  | 
  | 
-l | 
List loaded keys | 
|   | 
  | 
  | 
-l | 
List fingerprints of loaded keys | 
|   | 
  | 
  | 
-L | 
Lock agent | 
|   | 
  | 
  | 
-L | 
List loaded keys | 
|   | 
  | 
  | 
-N | 
PGP keys are identified by name | 
  | 
  | 
  | 
-p | 
Read passphrase from stdin | 
|   | 
  | 
  | 
-P | 
PGP keys are identified by fingerprint | 
|   | 
  | 
  | 
-R filename | 
Specify PGP keyring file | 
|   | 
  | 
  | 
-t timeout | 
Expire key after timeout | 
|   | 
  | 
  | 
-U | 
Unlock agent |