rstart
a sample implementation of a Remote Start client
see also :
rstartd - rsh
Synopsis
rstart
[-c context] [-g] [-l
username] [-v] hostname command args
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description
Rstart
is a simple implementation of a Remote Start client as
defined in "A Flexible Remote Execution Protocol Based
on rsh". It uses rsh as its underlying
remote execution mechanism.
options
-c
context
This option specifies the
context in which the command is to be run. A
context specifies a general environment the program
is to be run in. The details of this environment are
host-specific; the intent is that the client need not know
how the environment must be configured. If omitted, the
context defaults to X. This should be suitable for
running X programs from the host’s "usual" X
installation.
-g
Interprets command as a generic command,
as discussed in the protocol document. This is intended to
allow common applications to be invoked without knowing what
they are called on the remote system. Currently, the only
generic commands defined are Terminal,
LoadMonitor, ListContexts, and
ListGenericCommands.
-l
username
This option is passed to the
underlying rsh; it requests that the command be run
as the specified user.
-v
This option requests that rstart be verbose in
its operation. Without this option, rstart discards
output from the remote’s rstart helper, and
directs the rstart helper to detach the program from
the rsh connection used to start it. With this
option, responses from the helper are displayed and the
resulting program is not detached from the connection.
notes
This is a trivial implementation. Far more sophisticated
implementations are possible and should be developed.
Error handling is nonexistent. Without -v, error reports
from the remote are discarded silently. With -v, error
reports are displayed.
The $DISPLAY environment variable is passed. If it starts with a
colon, the local hostname is prepended. The local domain name
should be appended to unqualified host names, but isn’t.
The $SESSION_MANAGER environment variable should be passed, but
isn’t.
X11 authority information is passed for the current display.
ICE authority information should be passed, but isn’t. It isn’t
completely clear how rstart should select what ICE
authority information to pass.
Even without -v, the sample rstart helper will
leave a shell waiting for the program to complete. This causes no
real harm and consumes relatively few resources, but if it is
undesirable it can be avoided by explicitly specifying the "exec"
command to the shell, eg
rstart somehost exec xterm
This is obviously dependent on the command interpreter being used
on the remote system; the example given will work for the Bourne
and C shells.
see also
rstartd ,
rsh , A Flexible Remote Execution Protocol Based on
rsh
author
Jordan Brown,
Quarterdeck Office Systems