Shell Programming and Scripting

Hi All

I am trying to write a script that a user can use to start a a vncserver on a host and then connect to it, that bit is fine, i can do that using system commands

but i have defined the hosts to use at the top of my scirpt

Code:

my $allowedhosts  = (site_sg() ? 'host2,host1' : 'host3,host4');

which is a little bit of code that we have that checked for site you are in and if you are SG will use host2 and host1 and if not then host3 and hosts4

want i need is a way of when the checking each host and if the a vncserver is already running then going onto the next host in the list until it finds one that a server is not running

hope that makes sense

thanks