Use the curl command on unix based operating systems to grab web pages off the internet and save them on your local computer. You can use curl to download files using any popular protocol such as http https ftp etc.
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https://www.youtube.com/watch?v=VMJi7GIsYVg
Using the gzip command in unix to compress files. Using gzip along with the tar command to archive and compress a directory in one singe command.
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https://www.youtube.com/watch?v=A1V5pVo14RA