[Tex/LaTex] how to enter bold-backslash in latex

beamersymbols

I am using beamer making a presentation, I want to add a bold backslash inside a text, \textbf{\textbackslash} does not seem to work, can someone tell me please how to enter a bold-backslash?
the code is something like this:

\documentclass[xcolor=dvipsnames]{beamer} 
\usetheme{Boadilla}
\usecolortheme{beaver} 


\begin{document}

\begin{frame}{Differences in File-systems}
\begin{itemize}
\item (backslash) {\color{red}{\textbf{\textbackslash}}} in windows:\\ \vspace{5 mm}
\textbf{c:\textbackslash Documents and Settings\textbackslash Maria\textbackslash My Documents\textbackslash lec-1.doc}\vspace{5mm}
\item (forward slash) \textbf{{\color{red}{/}}} in linux: \\ \vspace{5 mm}
\end{itemize}
\end{frame}

\end{document}

Best Answer

Your question is very unclear but I assume from the tag you are using beamer.

\documentclass{beamer}


%\usepackage[T1]{fontenc}
%\showoutput
 \begin{document}
\begin{frame}
   \textbf{aaa\textbackslash}

  aaa \textbackslash 
\end{frame}
\end{document}

Produces the warning

LaTeX Font Warning: Font shape `OMS/cmss/bx/n' undefined
(Font)              using `OMS/cmsy/m/n' instead
(Font)              for symbol `textbackslash' on input line 11.

Telling you that \ comes from the math sans serif and there is no bold in OT1 encoding.

Adding

\usepackage[T1]{fontenc}

The warning goes away and you get:

enter image description here

where if you look closely (or at the output from \showoutput) the \ is bold.

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