RSH()																	     RSH()

NAME

       rsh - remote shell

SYNOPSIS

       rsh host [-l username] [-n] [-d] [-k realm] [-f | -F] [-x] [-PN | -PO] command

DESCRIPTION

       Rsh  connects to the specified host, and executes the specified command.  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.  This  implementa-
       tion  of  rsh  will accept any port for the standard error stream.  Interrupt, quit and terminate signals are propagated to the remote com-
       mand; rsh normally terminates when the remote command does.

       Each user may have a private authorization list in a file .k5login in his login directory.  Each line in this file should  contain  a  Ker-
       beros  principal  name  of  the form principal/instance@realm.  If there is a ~/.k5login file, then access is granted to the account if and
       only if the originater user is authenticated to one of the princiapls named in the ~/.k5login file.  Otherwise, the originating	user  will
       be  granted access to the account if and only if the authenticated principal name of the user can be mapped to the local account name using
       the aname -> lname mapping rules (see krb5_anadd(8) for more details).

OPTIONS

       -l username
	      sets the remote username to username.  Otherwise, the remote username will be the same as the local username.

       -x     causes the network session traffic to be encrypted.

       -f     cause nonforwardable Kerberos credentials to be forwarded to the remote machine for use by the  specified  command.   They  will	be
	      removed when command finishes.  This option is mutually exclusive with the -F option.

       -F     cause forwardable Kerberos credentials to be forwarded to the remote machine for use by the specified command.  They will be removed
	      when command finishes.  This option is mutually exclusive with the -f option.

       -k realm
	      causes rsh to obtain tickets for the remote host in realm instead of the remote host's realm as determined by krb_realmofhost(3).

       -d     turns on socket debugging (via setsockopt(2)) on the TCP sockets used for communication with the remote host.

       -n     redirects input from the special device /dev/null (see the BUGS section below).

       -PN

       -PO    Explicitly request new or old version of the Kerberos ``rcmd'' protocol.	The new protocol avoids many security  problems  found	in
	      the  old	one,  but  is  not  interoperable with older servers.  (An "input/output error" and a closed connection is the most likely
	      result of attempting this combination.)  If neither option is specified, some simple heuristics are used to guess which to try.

       If you omit command, then instead of executing a single command, you will be logged in on the remote host using rlogin(1).

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

	  rsh otherhost cat remotefile >> localfile

       appends the remote file remotefile to the local file localfile, while

	  rsh otherhost cat remotefile ">>" otherremotefile

       appends remotefile to otherremotefile.

FILES

       /etc/hosts
       ~/.k5login  (on remote host) - file containing Kerberos principals that are allowed access.

SEE ALSO

       rlogin(1), kerberos(3), krb_sendauth(3), krb_realmofhost(3)

BUGS

       If  you	are using csh(1) and put a rsh(1) 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 rsh to /dev/null using the -n option.

       You cannot run an interactive command (like rogue(6) or vi(1)); use rlogin(1).

       Stop signals stop the local rsh process only; this is arguably wrong, but currently hard to fix for  reasons  too  complicated  to  explain
       here.

																	     RSH()