CON(1) CON(1)
NAME
con, telnet, rx, hayes, xms, xmr - remote login, execution,
and XMODEM file transfer
SYNOPSIS
con [ -CdnrRsTv ] [ -b baud ] [ -l [ user ] ] [ -S svc ] [
-c cmd ] [net!]machine
telnet [ -dCrn ] [ -s svc ] [net!]machine
rx [ -eTr ] [ -l user ] [net!]machine [ command-word ... ]
hayes [ -pv ] number [ device ]
xms [ -1p ] file
xmr file
DESCRIPTION
Con connects to the computer whose network address is
net!machine and logs in if possible. With no options, the
account name used on the remote system is the same as that
on the local system. Standard input and output go to the
local machine.
Options are:
-b sets the baud rate of a dial-up connection to baud.
-n if the input is a file or pipe, do not hang up the con-
nection when EOF is received, but instead wait for the
remote end to hang up.
-l with an argument causes user to be used as the account
name on the remote system when performing BSD rlogin
authentication. Without an argument this option dis-
ables automatic login and a normal login session
ensues.
-C forces cooked mode, that is, local echo.
-c runs cmd as if it had been typed as a command from the
escape mode.
-v (verbose mode) causes information about connection
attempts to be output to standard error. This can be
useful when trying to debug network connectivity.
-d causes debugging information to be output to standard
error.
Page 1 Plan 9 (printed 11/18/24)
CON(1) CON(1)
-r suppresses printing of any carriage return followed by
a new line. This is useful since carriage return is a
printable character in Plan 9.
-R translates newlines to carriage returns and vice versa.
-T translates incoming carriage returns to newlines.
-s strips received characters to 7 bits to forestall mis-
interpretation of ASCII with parity as UTF.
-S Post a pipe as /srv/svc and connect it to standard
input and output. This can be used with -n to create a
standing connection that consolefs(4), for example, can
then open. For telnet, this option is -s.
The control-\ character is a local escape. It prompts with
>>>. Legitimate responses to the prompt are
i Send a quit [sic] signal to the remote machine.
q Exit.
b Send a break.
. Return from the escape.
!cmd Run the command with the network connection as its
standard input and standard output. Standard error
will go to the screen. This is useful for transmitting
and receiving files over the connections using programs
such as xms.
r Toggle printing of carriage returns.
Telnet is similar to con, but uses the telnet protocol to
communicate with the remote machine. It shares con's -C,
-d, -n, and -r options.
Rx executes one shell command on the remote machine as if
logged in there, but with local standard input and output.
A rudimentary shell environment is provided. If the target
is a Plan 9 machine, $service there will be rx. Options
are:
-e a zero length message will not be written to the con-
nection when standard input is closed.
-l runs as user on the remote machine if the remote is a
BSD machine.
-r same as for con
-T same as for con
Network addresses for both con and rx have the form
network!machine. Supported networks are those listed in
Page 2 Plan 9 (printed 11/18/24)
CON(1) CON(1)
/net.
Hayes dials number on a Hayes-compatible modem, device.
Under -p, it uses pulse dialing. Upon connecting, bytes are
copied bidirectionally between the connection and standard
input and output.
The commands xms and xmr respectively send and receive a
single file using the XMODEM protocol. They use standard
input and standard output for communication and are intended
for use with con. The -1 option to xms causes it to use
kilobyte packet size of 1024 bytes. The -p option causes it
to print a progress message every ten kilobytes.
EXAMPLES
rx kremvax cat file1 >file2
Copy remote file1 to local file2.
rx kremvax cat file1 '>file2'
Copy remote file1 to remote file2.
eqn paper | rx kremvax troff -ms | rx deepthought lp
Parallel processing: do each stage of a pipeline on a
different machine.
SOURCE
/sys/src/cmd/rx.c
/sys/src/cmd/ip/telnet.c
/sys/src/cmd/con for all other commands
SEE ALSO
cpu(1), ssh(1), telco(4)
BUGS
Con and telnet are merely obsolescent; the other commands
are obsolete and deprecated.
Under rx, a program that should behave specially towards
terminals may not: e.g., remote shells will not prompt.
Also under rx, the remote standard error and standard output
are combined and go inseparably to the local standard out-
put. Rx will consume its standard input by copying it to
the remote system, so redirect it from /dev/null if that's
not what you want.
Page 3 Plan 9 (printed 11/18/24)