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CentOS 7.0 - man page for ssh-add (centos section 1)

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

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

     ssh-add [-cDdkLlXx] [-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/identity.  After loading a private key, ssh-add will try to load corresponding cer-
     tificate 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 and their corre-
	     sponding 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 retry.

     -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.

     -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 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

	     Identifies the path of a UNIX-domain socket used to communicate with the agent.

	     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 recom-
	     mended on the computers without the hardware random generator because insufficient
	     entropy causes the connection to be blocked until enough entropy is available.

	     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 ECDSA 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.  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-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.

BSD					 December 3, 2012				      BSD

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