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Net：：SFTP

Since the remote file may not exist yet, we need to catch the exception that Net: : SFTP will throw when we try to determine its timestamp .

Ruby also has a decent open source SFTP library available (Net: : SFTP[0]) so I wasn't forced to write my own .

It's clear that steps one through three are easily handled by Ruby's built-in objects and Net: : SFTP.