From: mortee <mortee.lists@...>
Date: 2007-10-15T11:36:11+09:00
Subject: Re: irb, to learn more...

John Joyce wrote:
> There must be a way to jump in and out, leaving it running or not.
> For example, start irb.
> Then, create two named irb sessions inside it.
> You operate at the top level, monitor the two inside irb's...

There's no black magic here. In the online available version of the
Pickaxe book, you can find out about this:

http://www.rubycentral.com/pickaxe/irb.html

cb, irb_change_binding [  obj  ]
    Creates and enters a new binding that has its own scope for local
variables. If obj is given, it will be used as self in the new binding.

irb [obj]
    Starts an irb subsession. If obj is given, it will be used as self.

jobs, irb_jobs
    Lists irb subsessions.

fg n, irb_fg n
    Switches into the specified irb subsession. n may be any of the
following values:

    irb subsession number
    thread id
    irb object
    self (the obj that launched a particular subsession)

kill n, irb_kill n
    Kills an irb subsession. n may be any of the values as described for
irb_fg.