- adds RSA or DSA identities to the authentication agent
ssh-add [-cDdLlXx] [-t life] 
ssh-add -s reader
ssh-add -e reader
adds RSA or DSA identities to the authentication agent,
When run without arguments, it adds the files
. Alternative file names can be given on the command line.
If any file requires a passphrase,
asks for the passphrase from the user.
The passphrase is read from the user's tty.
retries the last passphrase if multiple identity files are given.
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:
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.
Deletes all identities from the agent.
Instead of adding the identity, removes the identity from the agent.
- -e reader
Remove key in smartcard
Lists public key parameters of all identities currently represented
by the agent.
Lists fingerprints of all identities currently represented by the agent.
- -s reader
Add key in smartcard
- -t life
Set a maximum lifetime when adding identities to an agent.
The lifetime may be specified in seconds or in a time format
Unlock the agent.
Lock the agent with a password.
- DISPLAY and SSH_ASKPASS
ssh-add needs a passphrase, it will read the passphrase from the current
terminal if it was run from a terminal.
ssh-add does not have a terminal associated with it but
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.)
Identifies the path of a unix-domain socket used to communicate with the
Contains the protocol version 1 RSA authentication identity of the user.
Contains the protocol version 2 DSA authentication identity of the user.
Contains the protocol version 2 RSA authentication identity of the user.
Identity files should not be readable by anyone but the user.
ssh-add ignores identity files if they are accessible by others.
Exit status is 0 on success, 1 if the specified command fails,
and 2 if
is unable to contact the authentication agent.
OpenSSH is a derivative of the original and free
ssh 1.2.12 release by Tatu Ylonen.
Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
Theo de Raadt and Dug Song
removed many bugs, re-added newer features and
Markus Friedl contributed the support for SSH
protocol versions 1.5 and 2.0.