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RedHat 9 (Linux i386) - man page for rsh (redhat section 1)

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
       implementation of rsh will accept any port for the standard error stream.  Interrupt, quit
       and  terminate  signals are propagated to the remote command; 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 Kerberos principal name of the form princi-
       pal/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  communi-
	      cation 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 interopera-
	      ble  with  older	servers.  (An "input/output error" and a closed connection is the
	      most likely result of attempting this combination.)  If neither  option  is  speci-
	      fied, 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()


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