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[Intro Music]

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We have just discussed how to use

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such powerful search utility as

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'find', and I have demonstrated to you

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how you could easily and fast find

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the necessary files and folders.

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Now let me explain to you how to use

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the archive, and the compress

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utilities like tar and gzip. Let's

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first have a look at the help for

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such command as 'tar'. Type 'tar', and

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here will be '--help', and

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you'll find a bunch of different

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options that this command has. And

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if I scroll to the beginning of

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this output, I'll see that this 'tar'

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utility 'saves many files together

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into a single tape or disk archive,

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and can restore individual files

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from the archive'. It means that the

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main purpose of this 'tar' utility is to

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create archive. An archive is

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simply a set of files and folders

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located in a single file. And

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such archives have usually

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extension 'tar', '.tar'. And this

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utility has a lot of different

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options like, 'c' - create new archive,

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't' - list the contents of the archive,

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'update', 'extract', and so on. There

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are many many different options,

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but of course you don't need to

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memorize all of them. Most common

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operations with the 'tar' utility

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are creation of the archive and

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extractions of the files from the

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archive. Also, using such option as 't'

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you are able to list the contents

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of the archive. But please notice

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that by default with just 'c' option,

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for example, you will not create

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compressed archive, you will simply

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create a tar file that will contain

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other files and folders. And if you

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want to additionally compress this

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archive, you could either use

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additional option with tar file

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that is '-z' option, or you could

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use another utility gzip. Let me

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show you help for this utility

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'gzip --help'. And if you'll

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scroll up, you'll find information

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about this utility. It compresses

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or uncompresses file or files. And

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you could create the archive using

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'tar' command, and afterwards compress

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that archive using 'gzip'

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utility; or you could use simply

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'-z' option inside of the

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'tar' utility, that will create the

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compressed archive automatically.

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And please note that such

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compressed archives will have

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following format, 'archive.tar.gz'.

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And that means that

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first archive is created with

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extension '.tar'; and afterwards

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this archive is compressed using

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'gzip' utility; and additional

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extension '.gz' is added. And

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that is the most common format of

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archives in Linux. And usually when

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you download some files, Linux

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files from internet, you download

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them in compressed archived format.

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And you'll see exactly such

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extension as '.tar.gz'. And of course

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using 'tar' utility you could easily

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uncompress and extract files from

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such archives. Alright, that is a

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short description of those two utilities.

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There are of course other

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compressed utilities like 'zip' that

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is very popular in Windows systems.

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But 'gzip' is most popular choice

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for Linux like systems. That's why

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most common extension that you will

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see is '.tar.gz'. Alright, next let's

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dive a bit into practice, and let's

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create some archives, and compress

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them. I'll see you in the next

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lecture. Bye.

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[no audio]