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Linux 2.6 - man page for ssh-add (linux section 1)

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
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. Any keys recorded in the blacklist of known-compromised keys (see ssh-vulnkey(1)) will be refused. 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 sig- naled 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 argu- ments, the keys for the default identities will be removed. Otherwise, the argument list will be inter- preted 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 keys provided by the PKCS#11 shared library 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 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.
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.
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.
EXIT STATUS
Exit status is 0 on success, 1 if the specified command fails, and 2 if ssh-add is unable to contact the authen- tication agent.
SEE ALSO
ssh(1), ssh-agent(1), ssh-keygen(1), ssh-vulnkey(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 contributed the support for SSH protocol versions 1.5 and 2.0.
BSD
October 28, 2010 BSD


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