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.\" $OpenBSD: rsh.1,v 1.10 2001/06/23 23:15:37 hin Exp $
.\"
.\" Copyright (c) 1983, 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" from: @(#)rsh.1 6.10 (Berkeley) 7/24/91
.\"
.Dd July 24, 1991
.Dt RSH 1
.Os
.Sh NAME
.Nm rsh
.Nd remote shell
.Sh SYNOPSIS
.Nm rsh
.Op Fl Kdnx
.Op Fl k Ar realm
.Op Fl l Ar username
.Ar hostname
.Op Ar command
.Sh DESCRIPTION
.Nm
executes
.Ar command
on
.Ar hostname .
.Pp
.Nm
copies its standard input to the remote command, the standard
output of the remote command to its standard output, and the
standard error of the remote command to its standard error.
Interrupt, quit and terminate signals are propagated to the remote
command;
.Nm
normally terminates when the remote command does.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl K
Disable all Kerberos authentication.
.It Fl d
Enable socket debugging (using
.Xr setsockopt 2 )
on the
.Tn TCP
sockets used for communication with the remote host.
.It Fl k
Causes
.Nm
to obtain tickets for the remote host in
.Ar realm
instead of the remote host's realm as determined by
.Xr krb_realmofhost 3 .
.It Fl l
By default, the remote username is the same as the local username.
The
.Fl l
option allows the remote name to be specified.
Kerberos authentication is used, and authorization is determined
as in
.Xr rlogin 1 .
.It Fl n
Redirect input from the special device
.Pa /dev/null
(see the
.Sx BUGS
section of this manual page).
.El
.Pp
If no
.Ar command
is specified, you will be logged in on the remote host using
.Xr rlogin 1 .
.Pp
If
.Nm
is not invoked with the standard program name
.Pq Dq rsh ,
it uses this name as its
.Ar hostname
argument.
.Pp
Shell meta-characters which are not quoted are interpreted on local machine,
while quoted meta-characters are interpreted on the remote machine.
For example, the command
.Pp
.Dl rsh otherhost cat remotefile >> localfile
.Pp
appends the remote file
.Ar remotefile
to the local file
.Ar localfile ,
while
.Pp
.Dl rsh otherhost cat remotefile \&">>\&" other_remotefile
.Pp
appends
.Ar remotefile
to
.Ar other_remotefile .
.\" .Pp
.\" Many sites specify a large number of host names as commands in the
.\" directory /usr/hosts.
.\" If this directory is included in your search path, you can use the
.\" shorthand ``host command'' for the longer form ``rsh host command''.
.Sh FILES
.Bl -tag -width /etc/hosts -compact
.It Pa /etc/hosts
.El
.Sh SEE ALSO
.Xr rlogin 1 ,
.Xr kerberos 3 ,
.Xr krb_realmofhost 3 ,
.Xr krb_sendauth 3 ,
.Xr rcmd 3
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.2 .
.Sh BUGS
If you are using
.Xr csh 1
and put a
.Nm
in the background without redirecting its input away from the terminal,
it will block even if no reads are posted by the remote command.
If no input is desired you should redirect the input of
.Nm
to
.Pa /dev/null
using the
.Fl n
option.
.Pp
You cannot run an interactive command
(like
.Xr rogue 6
or
.Xr vi 1 )
using
.Nm rsh ;
use
.Xr rlogin 1
instead.
.Pp
Stop signals stop the local
.Nm
process only; this is arguably wrong, but currently hard to fix for reasons
too complicated to explain here.
.Pp
.Nm
does not currently support encryption of the datastream when Kerberos
authentication is used.
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