==== SVN Tutorial ====
=== Starting with SVN ===
First lets assume you have a package called **__mypackage__** which contains your codes and header files (i.e., Root, mypackage ...)\\
Note that **$SVNUSR** variable should be define in your .bashrc file as \\
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export SVNUSR=svn+ssh://yourcernusername@svn.cern.ch/reps/atlas-yourcernusername/yourcernusername \\
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Now we want to send **__mypackage__** to the SVN using following steps:\\
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  1- Make a directory (outside of **__mypackage__**). Lets call it **temp**.
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  2- Create a local copy of **__mypackage__** inside **temp** directory.
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  3- Now we need to create a directory with the same name of **__mypackage__** in the SVN using following command:\\ ''svn mkdir -m "message" $SVNUSR/**__mypackage__**''\\ here instead of **message** you should provide a breif explanation. Note that if you ignore -m "message" option in the above command, an editor of your choice will be activated and you will need to enter the message into that.\\
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  4- Now it is the time to checkout **__mypackage__** into the SVN using:\\
'' svn co $SVNUSR/**__mypackage__**  **__mypackage__** '' \\ Instead of 'co' you can also use 'checkout'. At this step, you can actually see your package in the SVN using ''svn ls $SVNUSR'' which is empty since we still did not add files inside of **__mypackage__**.\\
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  5- Let's say there is a file at ''**__mypackage__**/**Root**''. We can add this to the svn using two following commands:\\
Go to ''**temp\mypackage**''\\  ''svn add **Root**''\\  you can see the result as 'A     Root'; A means Available. \\ ''svn commit **__mypackage__** -m "message"'' \\ you can see the result as 'Adding     Root' \\
Now all the files inside ''**__mypackage__**/**Root**'' are in your svn.\\

Let's say you have added a file called **mycode.cxx inside** ''**__mypackage__**/**Root**'' directory to your SVN. Once you make changes in **mycode.cxx** you need to update your SVN using following steps:\\
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1- Copy **mycode.cxx** into ''**temp\mypackage\Root**''\\
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2- Before adding your modified code, always update your SVN to the last version using \\
''svn update''\\
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If you want you can see the status of your SVN by ''svn status''. The result for this example is ' M   mycode.h' which means **mycode.cxx** has been modified. \\
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3- To add the modified code (i.e.,**mycode.cxx**) use : ''svn commit -m "message"'' \\