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rcmd.1 revision 1.18 
 $NetBSD: rcmd.1,v 1.18 2004/09/05 08:48:32 wiz Exp $

 Copyright (c) 1997 Matthew R. Green.
 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. 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
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 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 from: @(#)rsh.1 6.10 (Berkeley) 7/24/91
 from: NetBSD: rsh.1,v 1.3 1997/01/09 20:21:14 tls Exp

.Dd September 5, 2004
.Dt RCMD 1
.Os
.Sh NAME
.Nm rcmd
.Nd backend driver for
.Xr rcmd 3
.Sh SYNOPSIS
.Nm
.Op Fl l Ar username
.Op Fl u Ar localusername
.Ar host
.Ar command
.Sh DESCRIPTION
.Nm
executes
.Ar command
on
.Ar host .

p
.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.
The options are as follows:
l -tag -width flag t Fl d The
.Fl d
option turns on socket debugging (using
.Xr setsockopt 2 )
on the
.Tn TCP
sockets used for communication with the remote host.
t 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.
t Fl u The
.Fl u
option allows the local username to be specified.
Only the superuser is allowed to use this option.
t Fl n The
.Fl n
option redirects input from the special device

a /dev/null
(see the
.Sx BUGS
section of this manual page).
.El

p
Shell metacharacters which are not quoted are interpreted on local machine,
while quoted metacharacters are interpreted on the remote machine.
For example, the command

p
.Dl rcmd otherhost cat remotefile \*[Gt]\*[Gt] localfile

p
appends the remote file
.Ar remotefile
to the local file
.Ar localfile ,
while

p
.Dl rcmd otherhost cat remotefile "\*[Gt]\*[Gt]" other_remotefile

p
appends
.Ar remotefile
to
.Ar other_remotefile .
.Sh FILES
l -tag -width /etc/hosts -compact t Pa /etc/hosts .El
.Sh SEE ALSO
.Xr rsh 1 ,
.Xr rcmd 3 ,
.Xr environ 7
.Sh HISTORY
The
.Nm
command appeared in
.Nx 1.3
and is primarily derived from
.Xr rsh 1 .
Its purpose was to create a backend driver for
.Xr rcmd 3
that would allow the users of
.Xr rcmd 3
to no longer require super-user privileges.
.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

a /dev/null
using the
.Fl n
option.

p
You cannot use
.Nm rcmd
to run an interactive command (like
.Xr rogue 6
or
.Xr vi 1 ) .
Use
.Xr rlogin 1
instead.

p
The stop signal,
.Dv SIGSTOP ,
will stop the local
.Nm
process only.
This is arguably wrong, but currently hard to fix for reasons
too complicated to explain here.