Shell Programming and Scripting

I'd like to write up notes in a relatively readable format and then use a shell script to add LaTeX formatting. Specifically, I'm trying to figure out how to add the LaTeX newline character (\\) to the end of lines without \begin{} or \end{} statements

example notes file:
\begin{enumerate}
-- first note
\begin{itemize}
-- first sub-note that spans multiple lines
so new line characters would be really nice
otherwise this gets a bit hard to read
-- second sub-note
\end{itemize}
(lather, rise, repeat)
\end{enumerate}

So far I am using sed to change -- to \item and then using a LaTeX wrapper file to add header info and pdf it:

Code:

#!/bin/sh
# inputs: $1 - input notes file name (txt file)
#            $2 - output file name (pdf)

sed 's:--:\\item:g' $1 > tmpNotes.tex
# Need code to add \\ to end of text lines!

sed 's:INPUTFILE:tmpNotes.tex:' wrapper.tex > tmpWrapper.tex
pdflatex -nonstopmode tmpWrapper.tex 
mv tmpWrapper.pdf $2.pdf

Can someone tell me how to add \\ to only the text lines (that is, all lines without \begin{} or \end{})?
Thanks!

Code:

awk '!/^\\begin/&&!/^\\end/{$0=$0"\\\\"}1' filename

Sweet, thank you! I just changed it slightly so that it only adds the backslashes for lines with text in them:

Code:

awk '!/^\\begin/&&!/^$/&&!/^\\end/{$0=$0"\\\\"}1' filename