Checking for the availability

[Harish Chauhan]

Hi

I would like to know how to check for
the availability of a machine / folder and perform the task on the basis
of the outcome.

example :
If   "/<servername>/<foldername>
 is not available then copy the files from /<anotherservername>/<foldername>


Where this check needs to be embeded
?


Looking forward to your reply....

Thanks in advance....
Harish