1 many files in directory that shall be mirrored
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5 Request: MDTM $filename
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6 Response 213 20170215171525
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10 Getting files information (2%) [Waiting for response...]
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12 reason: lftp fetches dates of all files first, one request for each file.
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16 $ lftp -c "open ftp://user:pass@host; mirror --ignore-time --parallel=10 foldername/ ."
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