Re: DISPLAY setting
Re: DISPLAY setting
- Subject: Re: DISPLAY setting
- From: Rich Cook <email@hidden>
- Date: Wed, 31 Oct 2007 17:42:56 -0700
Handy and fancy! Thanks.
On Oct 31, 2007, at 5:16 PM, Greg Parker wrote:
On Oct 31, 2007, at 4:01 PM, Rich Cook wrote:
Why do you need to set DISPLAY at all? I did not know ssh looked
at your DISPLAY, I thought it always tunneled port 6000.
ssh looks at the DISPLAY present where you type `ssh -X/Y
example.com`. It needs to know where on the local machine to send
the data that it picks up from the remote machine. If DISPLAY is
not set then it doesn't forward anything.
Example:
foo% echo $DISPLAY
foo:0.0
foo% ssh -X bar
(ssh sets up forwarding from bar:10.0 to foo:0.0, i.e. bar port
6010 to foo port 6000, and sets DISPLAY on bar)
bar% echo $DISPLAY
bar:10.0
bar% xterm
(data flow: xterm -> bar port 6010 -> bar's sshd -> foo's ssh ->
foo port 6000 -> foo's X server -> foo's screen)
On Oct 31, 2007, at 3:52 PM, Greg Parker wrote:
On Oct 31, 2007, at 3:06 PM, Bobby Jones wrote:
The scenario I was thinking about is ssh from Tiger to Tiger
once you remove DISPLAY to accomodate Leopard. I had DISPLAY
exported in /etc/bashrc for all my Tiger installs. . . but
Leopard obviously doesn't play well with that.
So now I remove that to accommodate Leopard's X. . . but now
when I ssh Tiger to Tiger. . .obviously there is no DISPLAY
being passed. So I guess now I have to manually set DISPLAY
every time I ssh from Tiger to Tiger if I've removed DISPLAY to
accommodate Leopard's new X11?
The best way to handle this is to set DISPLAY if not already set,
in some appropriate shell startup file. The file to use and
syntax depend on which shell you're using; presumably adding an
appropriate `if` statement where you're already handling it in
Tiger will work.
The results:
Tiger: DISPLAY is not set, script sets it
Leopard: launchd set DISPLAY, script leaves it alone
SSH -Y out: ssh sees DISPLAY set at one end, ssh starts X
forwarding and sets DISPLAY at the other end
SSH -Y in: ssh set DISPLAY, script leaves it alone
--
Greg Parker email@hidden Runtime Wrangler
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✐Richard Cook
✇ Lawrence Livermore National Laboratory
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(opinions expressed herein are mine and not those of LLNL)
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✐The primary task of most software projects is to discover and
resolve these unknowns rather than to build a system. -- Philip G.
Armour
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Richard Cook
✇ Lawrence Livermore National Laboratory
Bldg-453 Rm-4037, Mail Stop L-557
7000 East Avenue, Livermore, CA, 94550, USA
☎ (office) (925) 423-9605
☎ (fax) (925) 423-6961
---
Information Management & Graphics Grp., Services & Development Div.,
Integrated Computing & Communications Dept.
(opinions expressed herein are mine and not those of LLNL)
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