To remove a file from the Git repository but not delete it from your filesystem, execute the following:
git rm --cached file_to_keep.txt; git commit -m "Removing file_to_keep.txt from Repository";
To remove a file from the Git repository and the filesystem, use the following:
git rm file_to_delete.txt; git commit -m "Removing and Deleting file_to_delete.txt";
When trying to enable the option that shows presentation notes on a different monitor using:
\setbeameroption{show notes on second screen=right}
we got the following error:
Undefined control sequence. …meroption{show notes on second screen=right}
Missing \begin{document}. …meroption{show notes on second screen=right}
pgfpages\usepackage{pgfpages}
dspdfviewer.https://dspdfviewer.danny-edel.de/
dspdfvieweris a pre-rendering and caching (read: fast) full-screen pdf viewer specifically designed for latex-beamer presentations, that were created with the show notes on second screen=right option (\setbeameroption{show notes on second screen=right}).
http://manpages.ubuntu.com/manpages/focal/man1/dspdfviewer.1.html
Special note: when we were testing dspdfviewer on Ubuntu 20.04LTS we thought that the secondary screen had to be on the left of the primary (because of the build command that specifies that notes need to be on the right). That was actually wrong, as you will see in the following picture even though we built the presentation to have the notes on the “right” dspdfviewer was able to work as expected even when the secondary screen was on top of the primary.
Having a presentation title that was too long, we wanted to change the middle part of the footline on the Boadilla theme to replace the command for the document title (\insertshorttitle) with the command for document subtitle (\insertshortsubtitle).
To do so, we added the following right before the \begin{document} command.
\setbeamertemplate{footline}
{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
\usebeamerfont{author in head/foot}\insertshortauthor\expandafter\ifblank\expandafter{\beamer@shortinstitute}{}{~(\insertshortinstitute)}
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
\usebeamerfont{title in head/foot}\insertshortsubtitle%\insertshorttitle
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
\usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
\usebeamertemplate{page number in head/foot}\hspace*{2ex}
\end{beamercolorbox}
}%
\vskip0pt%
}
When compiling the PDF, the result was as expected but we were getting a lot of errors for Undefined Control Sequence in various objects like the \begin{document} and \end{frame} commands. After modifying the following line (for the author name and institution) from this:
\usebeamerfont{author in head/foot}\insertshortauthor\expandafter\ifblank\expandafter{\beamer@shortinstitute}{}{~~(\insertshortinstitute)}
to this:
\usebeamerfont{author in head/foot}\insertshortauthor~~(\insertshortinstitute)
The errors were gone and the results were again the same. The final block that was properly working with no additional errors is the following:
\setbeamertemplate{footline}
{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
\usebeamerfont{author in head/foot}\insertshortauthor~~(\insertshortinstitute)
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
\usebeamerfont{title in head/foot}\insertshortsubtitle
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
\usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
\usebeamertemplate{page number in head/foot}\hspace*{2ex}
\end{beamercolorbox}
}%
\vskip0pt%
}
Each time you light your lighter,
your lighter gets lighter.
When your lighter gets too light,
it won’t light.
