DCON(1) DCON(1)
NAME
dcon, ndcon, rlogin, nrx, rsh, scriptcon - remote login and
execution
SYNOPSIS
dcon [ option ... ] machine
ndcon machine
rlogin machine
nrx machine [ command-word ... ]
rsh [ option ... ] machine [ command-word ... ]
scriptcon machine script
DESCRIPTION
Do not read this page unless you are familiar with con(1).
Dcon, ndcon, and rlogin are analogs (or special cases) of
con(1) for specific kinds of network connection. They sup-
port the same local escape convention with the quit signal.
Similarly, nrx and rsh are analogs of rx.
Network addresses are as in con(1). The default networks for
the various commands are
dcon, ndcon, nrx dk
rlogin, rsh tcp
Dcon connects to the remote machine, and attempts automati-
cally to log in under the login id of the invoking user.
Option -l turns off automatic login; the remote machine will
ask for a login id and password.
Ndcon behaves like dcon but provides a more transparent
transport protocol. In particular terminal line disciplines
are preserved and it is possible to download into a mux(9.1)
window across an ndcon connection.
Rlogin is like dcon, but uses the connection protocol found
on Berkeley systems.
Rx (see con(1)) executes one shell command on the remote
machine as if logged in there, with local standard input and
output. It uses a connection protocol specific to Research
machines.
DCON(1) DCON(1)
Nrx is to rx as ndcon is to dcon: it runs a command remotely
with line discipline preserved.
Rsh is to rx as rlogin is to dcon: it runs a command
remotely using the Berkeley execution protocol.
Scriptcon provides a connection like dcon -l, except that
the login and other initial protocol are controlled by a
script file. The first line of the file gives a string
(e.g. `login:') expected from the remote machine; the second
gives the local response, and so on in alternation. Unrec-
ognized data from the remote machine are ignored. Warning:
a script that contains a password may compromise the secu-
rity of the remote system, hence scriptcon should be used
only for restricted logins.
Con tries to connect using the protocol of ndcon; if that
fails, it tries that of dcon, then that of rlogin. Rx
attempts its own style of connection; if that fails, it
tries that of rsh.
SEE ALSO
con(1), dkmgr(8), svcmgr(8), tcpmgr(8), ipc(3)
D. L. Presotto, `Interprocess Communication in the Eighth
Edition UNIX System', this manual, Volume 2
BUGS
If a program run by nrx won't let go, for example by ignor-
ing signals, there is no way of getting out short of hanging
up.
There is no error correction or retry in a scriptcon script.