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Re: screen vs. multiple xterm's + remote connection

On Mon, Aug 16 at 03:58AM -0700, Paul Scott wrote:
> Will Trillich wrote:
> >you can now switch to console (alt-ctl-f1)

or another xterm or another tty anywhere (other computers,
possibly on other continents) :)

> >and do "screen -D -R" to reattach to your original session! 
> >
> My editor was emacs.  It remained running in X where without
> screen emacs was killed.  Indeed I could restart the screen
> session.

emacs wasn't running under X -- it was running at the command
line under screen! :)

> >make some more changes, go out for lunch...
> >
> >now visit a buddy across town and ssh in to your server from his
> >windows machine and do "screen -D -R" and take up where you left
> >off. when his computer freezes up, no worries (for you)...
> >
> >now you travel to piscataway and borrow an imac there to ssh in
> >to your home machine and do "screen -D -R" and resume your
> >undo/redo state, command-line history, suspended jobs et al --
> >as if you hadn't ever left that first xterm.
> >
> >priceless!
> > 
> >
> I haven't learned how to do this yet.

ah. hidden in my blather is the how-to -- also see the man page
for screen:

       -d|-D [pid.tty.host]
            does not start screen,  but  detaches  the  elsewhere
            running  screen  session.  It  has the same effect as
            typing "C-a d" from screen's controlling terminal. -D
            is  the  equivalent  to  the power detach key.  If no
            session can be detached, this option is  ignored.

so if you forgot to gracefully "^A d" detach a session at work
(or kill its operating window for example) you can force a
detach from elsewhere. suddenly, the cleaning folks at your
office are seeing your xterm say "[remote detached]" and now yuo
can reattach to it wherever you are. (note that your shell is
still active, tho -- the command line where you originally asked
for 'screen' is listening for commands.)

so now it's detached from your xterm at work -- how to reattach
it from home?

       -r [pid.tty.host]
       -r sessionowner/[pid.tty.host]
            resumes a detached screen session.  No other  options
            (except  combinations  with  -d/-D) may be specified,
            though an optional prefix of  [pid.]tty.host  may  be
            needed   to  distinguish  between  multiple  detached
            screen sessions.  The second form is used to  connect
            to  another  user's screen session which runs in mul­
            tiuser mode. This indicates that screen  should  look
            for   sessions  in  another  user's  directory.  This
            requires setuid-root.


> >in considering xterm and screen, they are NOT mutually
> >exclusive: i.e it's NOT "multiple xterms" VS. "multiple
> >screens". 
> >
> I didn't make that comparison.  "screen" was singular above. :)

it's a bit gray with the singular/plural, isn't it? one konsole
window can have several tabs; one screen instance (session?) can
have several virtual terminal processes (sessions?)...

> I have a DSL router connecting my LAN to the Internet.  I would
> like to learn and test some of the SSH combinations you do
> routinely.  I would need to use PuTTY on a Windows 98 machine
> on this LAN to try to find this Debian sid machine on the
> Internet to see if I can do any of this.  I have no trouble
> doing this on the LAN.  I will read some HOWTO's but would take
> any quick suggestions you have for doing this.

you need to be able to ssh in, and must have 'screen' available.
that's it!

	# start a screen session

	# do stuff, start editing, background a few manpages,
	# then close windows or leave them open and head for home


	# log in from home and detach the session at work:
	screen -d
	# if you closed your windows at work it'll already be
	# detached

	# reattach/resume your session:
	screen -r

the author's favorite is

	screen -D -R
	# detach if possible, and reattach it (or create a session)


to really have some fun, start TWO xterm windows side-by-side
(imagine that one of them is a troubled newbie and the other is a
helpful tech-head):

	1. screen

	2. screen -x

NOW edit something (doesn't matter which window you use). it's
fun to resize one of them and try to figure out what happens. :)

I use Debian/GNU Linux version 3.0;
Linux boss 2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i586 unknown
DEBIAN NEWBIE TIP #114 from D & E Radel <radel@inet.net.nz>
Installing gnome-apt (although a little buggy) is A GREAT WAY TO
with ease!
  Newbie tip: Also I discovered that
    apt-get remove [packagename]
works much better when there are dependancy problems than
    dpkg -r [packagename]

Also see http://newbieDoc.sourceForge.net/ ...

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