in reply to Keeping a local copy of a file up-to-date

The lwp-mirror command that comes with perl is for exactly this task. 

 lwp-mirror [-v] [-t timeout] <url> <local file>

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

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