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

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

SYNOPSIS
     ssh-add [-cDdLlXx] [-t life] [file ...]
     ssh-add -s pkcs11
     ssh-add -e pkcs11
     ssh-add -n [-T token]

DESCRIPTION
     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/identity.  After loading a private key, ssh-add will try
     to load corresponding certificate information from the filename obtained by appending
     -cert.pub 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 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 identities, removes identities from the agent.  If ssh-add
             has been run without arguments, the keys for the default identities will be
             removed.  Otherwise, the argument list will be interpreted as a list of paths
             to public key files and matching keys will be removed from the agent.  If no
             public key is found at a given path, ssh-add will append .pub and retry.

     -e pkcs11
             Remove key provided by pkcs11.

     -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 pkcs11
             Add key provided by 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

     -T token
             Explicitly set token name.  sshd_config(5).

     -X      Unlock the agent.

     -x      Lock the agent with a password.

ENVIRONMENT
     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.

     SSH_USE_STRONG_RNG
             The reseeding of the OpenSSL random generator is usually done from
             /dev/urandom.  If the SSH_USE_STRONG_RNG environment variable is set to value
             other than 0 the OpenSSL random generator is reseeded from /dev/random.  The
             number of bytes read is defined by the SSH_USE_STRONG_RNG value.  Minimum is
             14 bytes.  This setting is not recommended on the computers without the hard-
             ware random generator because insufficient entropy causes the connection to
             be blocked until enough entropy is available.

FILES
     ~/.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_ecdsa
             Contains the protocol version 2 ECDSA 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.

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

AUTHORS
     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 con-
     tributed the support for SSH protocol versions 1.5 and 2.0.

BSD                            December 12, 2017                           BSD

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