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
Using the for loop download each file associated with the internet addresses contained in the file. The for loop can be used in Unix any time you need to repeat some actions until some condition changes.
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https://www.youtube.com/watch?v=XI4YNCjQvxg