Continuous checking of a file

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http://www.unix.com – I have a requirement like this... I want to go to a particular server for which i have acess .I want to do a ssh to that server from one server and check if a file is theer or not..and i need the script to chcek continuosly till it finds the file.When it finds the file i want it to come out of the loop ..please let me know.. (HowTos)