freebsd/usr.bin/rsh/rsh.1

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.\"	@(#)rsh.1	8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd June 6, 1993
.Dt RSH 1
.Os
.Sh NAME
.Nm rsh
.Nd remote shell
.Sh SYNOPSIS
.Nm
.Op Fl 46Kdnx
.Op Fl t Ar timeout
.Op Fl k Ar realm
.Op Fl l Ar username
.Ar host
.Op command
.Sh DESCRIPTION
.Nm Rsh
executes
.Ar command
on
.Ar host .
.Pp
.Nm Rsh
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:
.Bl -tag -width flag
.It Fl 4
Use IPv4 addresses only.
.It Fl 6
Use IPv6 addresses only.
.It Fl K
Turn off all Kerberos authentication.
.It Fl d
Turn on socket debugging (using
.Xr setsockopt 2 )
on the
.Tn TCP
sockets used for communication with the remote host.
.It Fl k Ar realm
Cause
.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 Ar username
Allow the remote
.Ar username
to be specified.
By default, the remote username is the same as the local username.
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).
.It Fl x
Turn on
.Tn DES
encryption for all data exchange.
This may introduce a significant delay in response time.
.It Fl t Ar timeout
Allow a
.Ar timeout
to be specified (in seconds).  If no
data is sent or received in this time,
.Nm
will exit.
.El
.Pp
If no
.Ar command
is specified, you will be logged in on the remote host using
.Xr rlogin 1 .
.Pp
Shell metacharacters which are not quoted are interpreted on local machine,
while quoted metacharacters 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
.It Pa /etc/auth.conf
.El
.Sh SEE ALSO
.Xr rlogin 1 ,
.Xr setsockopt 2 ,
.Xr kerberos 3 ,
.Xr krb_realmofhost 3 ,
.Xr krb_sendauth 3 ,
.Xr rcmd 3 ,
.Xr ruserok 3 ,
.Xr auth.conf 5 ,
.Xr hosts 5 ,
.Xr hosts.equiv 5 ,
.Xr rlogind 8 ,
.Xr rshd 8
.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 ;
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.