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how to use X from remote

how to use X from remote ?  I just want to know the command to use the remote linux machine .

when I type xhost from ssh it gives  "unable to open the display"
3 Solutions

Server: device providing display, keyboard and mouse "services"
Client: computer running the software and using the server ti display data and accept user input

The client "finds" it's server by consulting the "$DISPLAY" environment variable.
(or the -display argument to some programs)
$ export DISPLAY
$ xterm &
$ xterm -display myserver2:0.0 &
on client: starts a xterm session on X-server and a xterm session on the first display on myserver2
(you may use "DISPLAY=hostname:displaynumber.screennumber" where any server may have 1/more displays with 1/more screens)

The server "allows" clients to connect via config files and/or the "xhost" command
$ xhost +
$ xhost myclient1
on server: authorizes clients and myclient1 to connect (display data and accept user input)
("xhost +" allows ANY client)
Wikipedia (http://en.wikipedia.org/wiki/X11) provides a short introduction to X11
Gabriel OrozcoSolution ArchitectCommented:
in order to use ssh to forward X traffic, you must edit your /etc/sshd_config file to allow that traffic.

here is a howto:

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sundeepgopalAuthor Commented:
hey DonConsolio,
Could you please tell me what is ??
where to use the following commands?/
$ export DISPLAY
$ xterm &
$ xterm -display myserver2:0.0 &
where to use this
$ xhost +
$ xhost myclient1
I'm confused and have no idea about it ,please tell me in detail

You don't need to export the display if you are using ssh...

ssh -Y <client>

of if that isn't working

ssh -X <client>

Then all you X stuff should work... (try issuing xterm on the connected target)

This does require you to have an X compatible desktop that you are running from. If you are running from Windows you need to get a X-server...

Gabriel OrozcoSolution ArchitectCommented:
even if you use ssh -X, if the ssh daemon on the remote computer does not have been edited to forward X, it will not work.

just edit it, uncomment the line, issue a service sshd restart, (you will be disconnected) and then try again using ssh -X <client>

for windows I use Xming (the best opensource X I have seen for windows):
If you are in windows: in xming start the xsession binary. then use PuTTY with X forwarding enabled, and then start whatever you want. an xterm can show you.
> how to use X from remote ?  I just want to know the command to use the remote linux machine .

> when I type xhost from ssh it gives  "unable to open the display"

"from remote" is not exactly a technical description of your problem :-)

are you looking for a way to tunnel a X session through ssh  or are
you trying to start a remote x program ?

in general you have to:
1) find out the names or IP addresses of "client" and "server" (see above)
2) on client:
- set $DISPLAY variable to server - client needs to know where to send output
(if you don't know how to set a variable just ask)
- then start your program
3) on server:
- allow client to connect - usually using the "xhost +name_of_client" command

sample session:
server name: asterix
client name: obelix

don@asterix > echo $DISPLAY  ### show server name
don@asterix > xhost +obelix $DISPLAY  ### allow obelix to connect
obelix being added to access control list
don@asterix > ping -c 5 obelix   ### verify network connection
PING obelix ( 56(84) bytes of data.
64 bytes from obelix ( icmp_seq=1 ttl=64 time=0.151 ms
64 bytes from obelix ( icmp_seq=2 ttl=64 time=0.149 ms
64 bytes from obelix ( icmp_seq=3 ttl=64 time=0.181 ms
64 bytes from obelix ( icmp_seq=4 ttl=64 time=0.179 ms
64 bytes from obelix ( icmp_seq=5 ttl=64 time=0.180 ms

--- spice.int.ops.co.at ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4002ms
rtt min/avg/max/mdev = 0.149/0.168/0.181/0.014 ms
don@asterix > ssh -l don obelix ### log on to client
don@obelix > DISPLAY=asterix:0.0
don@obelix > export DISPLAY
don@obelix > xterm # start my program


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