SSH-ADD(1)               BSD General Commands Manual              SSH-ADD(1)

NAME         top

     ssh-add — adds private key identities to the authentication agent

SYNOPSIS         top

     ssh-add [-cDdkLlqXx] [-E fingerprint_hash] [-t life] [file ...]
     ssh-add -s pkcs11
     ssh-add -e pkcs11

DESCRIPTION         top

     ssh-add adds private key identities to the authentication agent,
     ssh-agent(1).  When run without arguments, it adds the files
     ~/.ssh/id_rsa, ~/.ssh/id_dsa, ~/.ssh/id_ecdsa, and ~/.ssh/id_ed25519.
     After loading a private key, ssh-add will try to load corresponding
     certificate information from the filename obtained by appending to the name of the private key file.  Alternative file names
     can be given on the command line.

     If any file requires a passphrase, ssh-add asks for the passphrase from
     the user.  The passphrase is read from the user's tty.  ssh-add retries
     the last passphrase if multiple identity files are given.

     The authentication agent must be running and the SSH_AUTH_SOCK environ‐
     ment variable must contain the name of its socket for ssh-add to work.

     The options are as follows:

     -c      Indicates that added identities should be subject to confirma‐
             tion before being used for authentication.  Confirmation is
             performed by ssh-askpass(1).  Successful confirmation is sig‐
             naled by a zero exit status from ssh-askpass(1), rather than
             text entered into the requester.

     -D      Deletes all identities from the agent.

     -d      Instead of adding identities, removes identities from the
             agent.  If ssh-add has been run without arguments, the keys for
             the default identities and their corresponding certificates
             will be removed.  Otherwise, the argument list will be inter‐
             preted as a list of paths to public key files to specify keys
             and certificates to be removed from the agent.  If no public
             key is found at a given path, ssh-add will append .pub and

     -E fingerprint_hash
             Specifies the hash algorithm used when displaying key finger‐
             prints.  Valid options are: “md5” and “sha256”.  The default is

     -e pkcs11
             Remove keys provided by the PKCS#11 shared library pkcs11.

     -k      When loading keys into or deleting keys from the agent, process
             plain private keys only and skip certificates.

     -L      Lists public key parameters of all identities currently repre‐
             sented by the agent.

     -l      Lists fingerprints of all identities currently represented by
             the agent.

     -q      Be quiet after a successful operation.

     -s pkcs11
             Add keys provided by the PKCS#11 shared library pkcs11.

     -t life
             Set a maximum lifetime when adding identities to an agent.  The
             lifetime may be specified in seconds or in a time format speci‐
             fied in sshd_config(5).

     -X      Unlock the agent.

     -x      Lock the agent with a password.

ENVIRONMENT         top

             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 (by default “ssh-askpass”) and open an X11 window
             to read the passphrase.  This is particularly useful when call‐
             ing 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 agent.

FILES         top

             Contains the DSA authentication identity of the user.

             Contains the ECDSA authentication identity of the user.

             Contains the Ed25519 authentication identity of the user.

             Contains the 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.

EXIT STATUS         top

     Exit status is 0 on success, 1 if the specified command fails, and 2 if
     ssh-add is unable to contact the authentication agent.

SEE ALSO         top

     ssh(1), ssh-agent(1), ssh-askpass(1), ssh-keygen(1), sshd(8)

AUTHORS         top

     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 created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.

COLOPHON         top

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BSD                            August 29, 2017                           BSD