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    <p><em>Assuming your system is unix-like</em>, and the other side has an open SSH server, I would add the public key of the user that your application runs under to the authorized_keys file in the remote side. After this, your application would be able to poll for the existence of an updated file by running</p> <pre><code>ssh username_at_remote_end@ip_address_of_remote stat -C %Z path_to_file </code></pre> <p>Which will output the seconds after the unix Epoch of the last change to the file (if found) or error (non-zero exit code) if file not found.</p> <p>To actually retrieve the file (after checking that the time-stamp is within the last 24 hours), I would use</p> <pre><code>t=$(mktemp -d) &amp;&amp; scp username_at_remote_end@ip_address_of_remote:path_to_file $t &amp;&amp; echo $t </code></pre> <p>Which will copy it to a temporary directory under <code>/tmp</code>, readable only by the user that your application is running under, and will return the name of that folder.</p> <p>All programming languages support running commands locally (in C, using <code>system()</code>; in Java, using a <code>Process</code>; ...). To keep things simple, each command would be added to a script file (say <code>poll.sh</code> and <code>retrieve.sh</code>). If the remote end changes, you only have to update &amp; test the scripts. There are direct interfaces to <code>openssh</code>, but it is probably simpler to outsource all of that work to <code>bash</code> via scripts as seen above.</p>
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    1. POHow should a system get data from a remote third party data source?
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    1. CO+1 for simplicity. There is no complicated logic in polling for a csv through sftp, I usually do it through a cron job every x minutes or whichever interval fits the usecase. One can add a simple check to see if the file has already been downloaded. Very low maint compared to SSIS and so on, as the required tools and logic are both simple to use and directly available through the shell.
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