Check wether a X server is running and ok
 

Basically I need a more reliable way to check wether a X server is ok than using ps/pgrep.
Is there a (standard) application which connects to a X server and exits again giving me the status? Something like "xterm -e exit".

# xset -q

( q - for query )

It works good for me. The only case it is missing is the shortage of file descriptors.

what about ....
(running on a tty, not on a terminal inside X)

Thanks, both answers answer my question and I appreciate your help.