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    <p>This appears to change your shell's working directory to the directory where the script is stored. This is probably done so that the script can refer to other things in the same directory as itself.</p> <p>I've used a variant of this before, <code>location=$(dirname $0)</code>. This does not change the directory, but rather stores the script's path for later use. <code>dirname $0</code> takes a filename (in this case, $0 or the path where the shell found that file), and <code>echo</code>es the directory that it is stored in. Wrapping a command (or a sequence of commands) in a <code>$()</code> combination causes the <em>output</em> of the command (whatever is printed to the screen by <code>echo</code>, <code>df</code>, <code>cat</code>, etc) to replace that expression using <code>$()</code>. Example: <code>variable=$(echo "test")</code> becomes <code>variable="test"</code></p> <p>As in other programming languages, <code>$()</code> can be nested. An example is: <code>variable=$(echo $(echo "test"))</code> The inner-most expression will print 'test', which will then be substituted as the argument to the outermost <code>echo</code>. The output of this <code>echo</code> will then be substituted as the value to store in <code>variable</code> - the result of the first and second example will be identical. A stupid example. but it works.</p> <p>The only different between <code>$(dirname $(readlink -f $0))</code> and <code>$(dirname $0)</code> that I can see is that the former always returns the <em>absolute path</em>. The latter can return the relative path or the absolute path, depending on where the working directory is in relation to the script.</p>
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    1. CO-1 too much spoon-feeding.
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    2. CO`Shouldn't this be on SO?` Shouldn't you have flagged it as off topic?
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    3. CO+1 for being a good and complete answer
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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