Is it possible to reconnect a process to a terminal after it has
and logging out?Most variants of Unix do not support "detaching" and "attaching"
processes, as operating systems such as VMS and Multics support.
However, there are three freely redistributable packages which can
be used to start processes in such a way that they can be later
reattached to a terminal.
The first is "screen," which is described in the
comp.sources.unix archives as "Screen, multiple windows on a CRT"
(see the "screen-3.2" package in comp.sources.misc, volume 28.)
This package will run on at least BSD, System V r3.2 and SCO UNIX.
The second is "pty," which is described in the comp.sources.unix
archives as a package to "Run a program under a pty session" (see
"pty" in volume 23). pty is designed for use under BSD-like
system only.
The third is "dislocate," which is a script that comes with the
expect distribution. Unlike the previous two, this should run on
all UNIX versions. Details on getting expect can be found in
question 3.9 .
None of these packages is retroactive, i.e. you must have
started a process under screen or pty in order to be able to
detach and reattach it.
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