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1.\" -*- nroff -*-
2.\"
3.\" ssh-add.1
4.\"
5.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
6.\"
7.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8.\" All rights reserved
9.\"
10.\" Created: Sat Apr 22 23:55:14 1995 ylo
11.\"
12.\" $Id: ssh-add.1,v 1.1 1999/10/27 03:42:45 damien Exp $
13.\"
14.Dd September 25, 1999
15.Dt SSH-ADD 1
16.Os
17.Sh NAME
18.Nm ssh-add
19.Nd adds identities for the authentication agent
20.Sh SYNOPSIS
21.Nm ssh-add
22.Op Fl ldD
23.Op Ar
24.Sh DESCRIPTION
25.Nm
26adds identities to the authentication agent,
27.Xr ssh-agent 1 .
28When run without arguments, it adds the file
29.Pa $HOME/.ssh/identity .
30Alternative file names can be given on the
31command line. If any file requires a passphrase,
32.Nm
33asks for the passphrase from the user.
34The Passphrase it is read from the user's tty.
35.Pp
36The authentication agent must be running and must be an ancestor of
37the current process for
38.Nm
39to work.
40.Pp
41The options are as follows:
42.Bl -tag -width Ds
43.It Fl l
44Lists all identities currently represented by the agent.
45.It Fl d
46Instead of adding the identity, removes the identity from the agent.
47.It Fl D
48Deletes all identities from the agent.
49.El
50.Sh FILES
51.Bl -tag -width Ds
52.Pa $HOME/.ssh/identity
53Contains the RSA authentication identity of the user. This file
54should not be readable by anyone but the user.
55Note that
56.Nm
57ignores this file if it is accessible by others.
58It is possible to
59specify a passphrase when generating the key; that passphrase will be
60used to encrypt the private part of this file. This is the
61default file added by
62.Nm
63when no other files have been specified.
64.Pp
65If
66.Nm
67needs a passphrase, it will read the passphrase from the current
68terminal if it was run from a terminal. If
69.Nm
70does not have a terminal associated with it but
71.Ev DISPLAY
72is set, it
73will open an X11 window to read the passphrase. This is particularly
74useful when calling
75.Nm
76from a
77.Pa .Xsession
78or related script. (Note that on some machines it
79may be necessary to redirect the input from
80.Pa /dev/null
81to make this work.)
82.Sh AUTHOR
83Tatu Ylonen <ylo@cs.hut.fi>
84.Pp
85OpenSSH
86is a derivative of the original (free) ssh 1.2.12 release, but with bugs
87removed and newer features re-added. Rapidly after the 1.2.12 release,
88newer versions bore successively more restrictive licenses. This version
89of OpenSSH
90.Bl -bullet
91.It
92has all components of a restrictive nature (ie. patents, see
93.Xr ssl 8 )
94directly removed from the source code; any licensed or patented components
95are chosen from
96external libraries.
97.It
98has been updated to support ssh protocol 1.5.
99.It
100contains added support for
101.Xr kerberos 8
102authentication and ticket passing.
103.It
104supports one-time password authentication with
105.Xr skey 1 .
106.El
107.Pp
108The libraries described in
109.Xr ssl 8
110are required for proper operation.
111.Sh SEE ALSO
112.Xr ssh 1 ,
113.Xr ssh-agent 1 ,
114.Xr ssh-keygen 1 ,
115.Xr sshd 8 ,
116.Xr ssl 8