rstart - a sample implementation of a Remote Start client
rstart [-c context] [-g] [-l username] [-v] hostname command
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.
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. This option is passed to the
underlying rsh; it requests that the command be run as the
specified user. 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.
The rstart command 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.
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 is not.
The $SESSION_MANAGER environment variable should be
passed, but is not.
X11 authority information is passed for the current display.
ICE authority information should be passed, but is not.
It is not 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, for example,
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.
rstartd(1X), rsh(1), A Flexible Remote Execution Protocol
Based on rsh
Jordan Brown, Quarterdeck Office Systems
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