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


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


     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 environment 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 confirmation before being used
             for authentication.  Confirmation is performed by ssh-askpass(1).  Successful
             confirmation is signaled 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
             interpreted 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 retry.

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

     -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 represented 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 specified in sshd_config(5).

     -X      Unlock the agent.

     -x      Lock the agent with a password.


             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 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 agent.


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


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


     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.