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What is Li-Fi? Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds. Li-Fi uses common household LED (light emitting diodes) lightbulbs to enable data transfer, boasting speeds of up to 224 gigabits per second. The term Li-Fi was coined by University of Edinburgh Professor Harald Haas during a TED Talk in 2011. Haas envisioned light bulbs that could act as wireless routers. Subsequently, in 2012 after four years of research, Haas set up company pureLiFi with the aim 'to be the world leader in Visible Light Communications technology'. How it works Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves while Li-Fi runs on visible light. As we now know, Li-Fi is a Visible Light Communications (VLC) system. This means that it accommodates a photo-detector to receive light signals and a signal processing e...

rsync -abviuzP src/ dest/ -i  turns on the itemized format, which shows more information than the default format -b  makes rsync backup files that exist in both folders, appending  ~  to the old file. You can control this suffix with  --suffix .suf -u  makes rsync transfer skip files which are newer in dest than in src -z  turns on compression, which is useful when transferring easily-compressible files over slow links -P  turns on  --partial  and  --progress --partial  makes rsync keep partially transferred files if the transfer is interrupted --progress  shows a progress bar for each transfer, useful if you transfer big files Someone suggest to use:      rsync -abuP rsync synchronizes in one direction from source to destination. Therefore the following statement rsync -avh --progress Source Destination syncs everything from  Source  to  Destination . The merged folder res...