The authentication agent must be running and the SSH_AUTH_SOCK environment variable must contain the name of its socket for ssh-add to work.
The options are as follows:
Tag | Description |
---|---|
-c | Indicates that added identities should be subject to confirmation before being used for authentication. Confirmation is performed by the SSH_ASKPASS program mentioned below. Successful confirmation is signaled by a zero exit status from the SSH_ASKPASS program, rather than text entered into the requester. |
-D | Deletes all identities from the agent. |
-d | Instead of adding the identity, removes the identity from the agent. |
-e reader | |
Remove key in smartcard reader. | |
-L | Lists public key parameters of all identities currently represented by the agent. |
-l | Lists fingerprints of all identities currently represented by the agent. |
-s reader | |
Add key in smartcard reader. | |
-t life | |
Set a maximum lifetime when adding identities to an agent. The lifetime may be specified in seconds or in a time format specified in sshd_config(5). | |
-X | Unlock the agent. |
-x | Lock the agent with a password. |
Tag | Description |
---|---|
DISPLAY and SSH_ASKPASS | |
If ssh-add needs a passphrase, it will read the passphrase from the current terminal if it was run from a terminal. If ssh-add does not have a terminal associated with it but DISPLAY and SSH_ASKPASS are set, it will execute the program specified by SSH_ASKPASS and open an X11 window to read the passphrase. This is particularly useful when calling ssh-add from a .xsession or related script. (Note that on some machines it may be necessary to redirect the input from /dev/null to make this work.) | |
SSH_AUTH_SOCK | |
Identifies the path of a unix-domain socket used to communicate with the agent. |
Tag | Description |
---|---|
~/.ssh/identity | |
Contains the protocol version 1 RSA authentication identity of the user. | |
~/.ssh/id_dsa | |
Contains the protocol version 2 DSA authentication identity of the user. | |
~/.ssh/id_rsa | |
Contains the protocol version 2 RSA authentication identity of the user. |
Identity files should not be readable by anyone but the user. Note that ssh-add ignores identity files if they are accessible by others.
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