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.\" -*- nroff -*-
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.\"
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.\" ssh-add.1
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.\"
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.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
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.\"
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.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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.\" All rights reserved
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.\"
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.\" Created: Sat Apr 22 23:55:14 1995 ylo
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.\"
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.\" $Id: ssh-add.1,v 1.11 2000/03/23 21:11:38 aaron Exp $
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.\"
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.Dd September 25, 1999
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.Dt SSH-ADD 1
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.Os
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.Sh NAME
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.Nm ssh-add
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.Nd adds identities for the authentication agent
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.Sh SYNOPSIS
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.Nm ssh-add
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.Op Fl lLdD
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.Op Ar
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.Sh DESCRIPTION
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.Nm
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adds identities to the authentication agent,
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.Xr ssh-agent 1 .
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When run without arguments, it adds the file
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.Pa $HOME/.ssh/identity .
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Alternative file names can be given on the command line.
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If any file requires a passphrase,
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.Nm
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asks for the passphrase from the user.
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The Passphrase it is read from the user's tty.
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.Pp
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The authentication agent must be running and must be an ancestor of
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the current process for
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.Nm
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to work.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl l
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Lists fingerprints of all identities currently represented by the agent.
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.It Fl L
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Lists public key parameters of all identities currently represented by the agent.
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.It Fl d
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Instead of adding the identity, removes the identity from the agent.
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.It Fl D
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Deletes all identities from the agent.
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.El
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.Sh FILES
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.Bl -tag -width Ds
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.It Pa $HOME/.ssh/identity
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Contains the RSA authentication identity of the user.
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This file should not be readable by anyone but the user.
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Note that
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.Nm
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ignores this file if it is accessible by others.
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It is possible to
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specify a passphrase when generating the key; that passphrase will be
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used to encrypt the private part of this file.
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This is the default file added by
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.Nm
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when no other files have been specified.
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.Pp
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.Sh ENVIRONMENT
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.Bl -tag -width Ds
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.It Ev "DISPLAY" and "SSH_ASKPASS"
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If
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.Nm
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needs a passphrase, it will read the passphrase from the current
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terminal if it was run from a terminal.
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If
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.Nm
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does not have a terminal associated with it but
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.Ev DISPLAY
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and
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.Ev SSH_ASKPASS
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are set, it will execute the program specified by
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.Ev SSH_ASKPASS
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and open an X11 window to read the passphrase.
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This is particularly useful when calling
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.Nm
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from a
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.Pa .Xsession
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or related script.
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(Note that on some machines it
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may be necessary to redirect the input from
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.Pa /dev/null
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to make this work.)
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.Sh AUTHOR
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Tatu Ylonen <ylo@cs.hut.fi>
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.Pp
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OpenSSH
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is a derivative of the original (free) ssh 1.2.12 release, but with bugs
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removed and newer features re-added.
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Rapidly after the 1.2.12 release,
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newer versions bore successively more restrictive licenses.
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This version of OpenSSH
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.Bl -bullet
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.It
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has all components of a restrictive nature (i.e., patents, see
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.Xr ssl 8 )
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directly removed from the source code; any licensed or patented components
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are chosen from
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external libraries.
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.It
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has been updated to support ssh protocol 1.5.
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.It
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contains added support for
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.Xr kerberos 8
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authentication and ticket passing.
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.It
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supports one-time password authentication with
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.Xr skey 1 .
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.El
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.Pp
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The libraries described in
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.Xr ssl 8
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are required for proper operation.
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.Sh SEE ALSO
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.Xr ssh 1 ,
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.Xr ssh-agent 1 ,
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.Xr ssh-keygen 1 ,
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.Xr sshd 8 ,
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.Xr ssl 8
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