[all variants] How can I search for foo.bar in folder /xyz/ and subfolders in our webhost?

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http://ubuntuforums.org – Hello, We have a webhost/domain/website mywebsite.com. We are able to add/delete/rename files using filezilla. We are trying to find a file foo.bar on our domain. How can I make my computer search for the file on the remote server of ours? I tried manually peeking through several folders and subfolders but gave up. Thank you. (Hardware)