rstart - Online in the Cloud

PROGRAM:

NAME

rstart - a sample implementation of a Remote Start client

SYNOPSIS

rstart [-c context] [-g] [-l username] [-v] hostname command args ...

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.

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