Problem setting display using vnc viewer Post: 302490616

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Top Forums UNIX for Dummies Questions & Answers Problem setting display using vnc viewer Post 302490616 by sarbjit on Tuesday 25th of January 2011 09:51:31 AM

01-25-2011

Registered User

Problem setting display using vnc viewer

Hi All,

I am having a linux machine and i used to work on this machine either directly or by using vncviewer from my windows machine. So everytime i launch new terminal on my vnc view i need to set DISPLAY. So i added the following code in my .cshrc

Code:

if ($?VNCDESKTOP == 1) then
setenv DISPLAY  `echo $VNCDESKTOP | awk '{printf $1}'`
else
setenv DISPLAY ${HOSTNAME}:0
endif

So in this code i am checking that if VNCDESKTOP variable is set, so that means i am using vncviewer and set DISPLAY as per Vncviewer i had opened otherwise i am working directly on Linux machine.

Now this code works fine as long as i work on my own machine. Problem is when i did rsh to some other linux machine.

Problem1:
If i do rsh on my linux standalone machine, then HOSTNAME is changed and else part of code is of no use. So i have to hard code this part. Can some one tell me how can i make it work, i searched on net and found some thing about $REMOTEHOST. So can i use this for this problem.

Problem2:
Problem1 however has a workaround that i can hard code display but problem 2 is more severe. When i do rsh using my vncviewer, i found that VNCDESKTOP is not set there. Hence i again need to set it manually. Is there any other variable or way by which i can detect that i am still on vncviewer and can set DISPLAY.

Thanks
Sarbjit

sarbjit

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LEARN ABOUT REDHAT

xon

XON(1)							      General Commands Manual							    XON(1)

NAME

       xon - start an X program on a remote machine

SYNOPSIS

       xon remote-host [-access] [-debug] [-name window-name] [-nols] [-screen screen-no] [-user user-name] [command ...]

DESCRIPTION

       Xon runs the specified command (default xterm -ls) on the remote machine using rsh, remsh, or rcmd.  Xon passes the DISPLAY, XAUTHORITY and
       XUSERFILESEARCHPATH environment variables to the remote command.

       When no command is specified, xon runs 'xterm -ls'.  It additionally specifies the application name to be 'xterm-remote-host' and the  win-
       dow title to be '-fIremote-host'.

       Xon  can  only  work  when  the	remote host will allow you to log in without a password, by having an entry in the .rhosts file permitting
       access.

OPTIONS

       Note that the options follow the remote host name (as they do with rlogin).

       -access
	      Runs xhost locally to add the remote host to the host access list in the X server.  This won't work unless xhost is given permission
	      to modify the access list.

       -debug Normally,  xon  disconnects the remote process from stdin, stdout and stderr to eliminate the daemon processes which usually connect
	      them across the network.	Specifying the -debug option leaves them connected so that error messages from the  remote  execution  are
	      sent back to the originating host.

       -name window-name
	      This specifies a different application name and window title for the default command (xterm).

       -nols  Normally xon passes the -ls option to the remote xterm; this option suspends that behaviour.

       -screen screen-no
	      This changes the screen number of the DISPLAY variable passed to the remote command.

       -user user-name
	      By  default, xon simply uses rsh/remsh/rcmd to connect to the remote machine using the same user name as on the local machine.  This
	      option cause xon to specify an alternative user name.  This will not work  unless  you  have  authorization  to  access  the  remote
	      account, by placing an appropriate entry in the remote users .rhosts file.

BUGS

       Xon can get easily confused when the remote-host, user-name or various environment variable values contain white space.

       Xon has no way to send the appropriate X authorization information to the remote host.

X Version 11							    Release 6.6 							    XON(1)