fix compile issue, add instructions

README.md

@@ -1,2 +1,4 @@
 # linux-101
 An introduction to using the Linux command line on the DCS Machines, with sessions run at the start of every academic year.
+
+To get set up and editing locally, one way is to download TeX Live, and install something like the LaTeX Workshop extension for VSCode.

cheatsheet.tex

@@ -138,7 +138,7 @@ \section*{Commands and Options}
     \item \texttt{-R} | Recursively modifies permissions inside a subdirectory.
     \item User types: \texttt{u} user, \texttt{g} user group, \texttt{o} other
     \item Permissions \texttt{r} read, \texttt{w} write, \texttt{x} execute
-    \item Permissions formats: \texttt{u+x} add execute to user, \texttt{g=rw} set group permission to read & write; \texttt{755} set permissions to \texttt{u=rwx,g=rx,o=rx}.
+    \item Permissions formats: \texttt{u+x} add execute to user, \texttt{g=rw} set group permission to read and write; \texttt{755} set permissions to \texttt{u=rwx,g=rx,o=rx}.
 \end{itemize}