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Convenince labels added to the top of each file to assist in creating
index-type help files for things like the XML editor screen (where
there's nothing to hook help to).

\label{Variables_in_Scripts}

Variables can be used later in the same script. For instance, we can add
another line below the \texttt{\$variable} line as such:

\begin{lyxcode}
\$variable2~=~\$variable~+~2;
\end{lyxcode}

Now there is a variable called \texttt{\$variable2} with the the number {}``5''
as its value. 

Variables can also be used in \emph{strings}\index{strings}, which are a
sequence of letters. The underlying language of the script, Perl, has a very
large number of ways of using variables in strings, but the easiest and most
common way is to use normal double-quotes and just spell out the name of
the variable you want to use in the string, like this:

\begin{lyxcode}
\$stringVar~=~{}``I~have~a~variable~with~the~value~\$variable.''
\end{lyxcode}

This will put the string {}``I have a variable with the value 3.'' into
the variable named {}``stringVar''.