From 7ddaea99769423bca3d854c863afac453e8a28dc Mon Sep 17 00:00:00 2001
From: brunnn <brunnn@usi.ch>
Date: Fri, 16 Nov 2018 22:10:59 +0000
Subject: [PATCH] frontpage: added page about cmd tar

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@240 a672b425-5310-4d7a-af5c-997e18724b81
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+---
+layout: page
+category_title: interm
+category-page: interm
+tags: tar shell command compress archive
+author: Nicola Brunner
+title: tar
+---
+
+<p>The <code>tar</code> command is used to create and manipulate streaming archive files, in
+  other words it is used to compress and extract files and directories. He can
+  extract from many file formats like: tar, pax, cpio, zio, jar, ar and ISO 9660
+  cdrom images and create tar, pax, cpio, ar, and shar archives.</p>
+<br>
+
+<h3>Usage:</h3>
+
+<p>There are different syntaxes for this command:</p>
+<pre>tar {-c} [options] [files | directories]</pre>
+<p>The first one is the default syntax. Where <code>{-c}</code> stays for the
+  creation of a new archive, <code>[options]<code> for the different flags that
+    we can use, <code>[files | directories]</code> for the files or directories
+    that we want to compress.<p>
+<pre>tar {-r | -u} -f archive-file [options] [files | directories]<br>
+tar {-t | -x} [options] [patterns]<br>
+tar [bundled-flags <args>] [<file> | <pattern> ...]</pre>
+<p>The last one shows a “bundled” option word provided for compatibility with
+  historical implementations.</p>
+<br>
+
+<h3>Flags:</h3>
+
+<p>This command has a large number of options, but you just need to remember a
+  few letters for the most important ones:</p>
+
+<ul>
+  <li><code>-c</code> creates a new archive, that contains the specified items.</li>
+  <li><code>-r</code> is like <code>-c</code> but appends the new entries to the
+     archive, requires the <code>-f</code> option.</li>
+  <li><code>-u</code> is like <code>-r</code> but adds the new entries only if
+    the date is newer than the corresponding entry date of the file/directory to
+    the archive, requires the <code>-f</code> option.</li>
+  <li><code>-t</code> lists the archive contents to the terminal output.</li>
+  <li><code>-v</code> is used to display the progress of an archive creation in
+    the terminal.</li>
+  <li><code>-f</code> allows to specify the name of an archive.</li>
+  <li><code>-x</code> is used to extract files from an archive to the disk.</li>
+  <li><code>--exclude</code> does not compress specified files or directories.</li>
+  <li><code>--include</code> compresses specified file or directories. It's
+    important to know that <code>--exclude</code> take precedence over inclusions.
+    The <code>--include</code> option is useful when you want to filter archives</li>
+</ul>
+
+<p>If you don’t find here an option that you search, or you are interested to read
+more about this command, you can write in your terminal:<p>
+<pre>tar man</pre>
+<br>
+
+<h3>Example:</h3>
+<pre>tar -cvf archive.zip makesmaller.jpg</pre>
+<p>In this case, we take the file <code>makesmaller.jpg</code> and compress it
+  to <code>archive.zip</code>. We use the options <code>-cvf</code>, <code>-c </code>
+  for creating a new archive, <code>-v</code> for displaying the progress of the
+  operation and <code>-f</code> for specifying the name of the archive.
+
+<pre>tar -cvf archive.zip makesmaller.jpg alsome.txt</pre>
+<p>It’s the same case as before, but we wanted to add also <code>alsome.txt</code>
+  to <code>archive.zip</code>.