cheat-sheetlet.tex

\documentclass{minimal}%
\usepackage[letterpaper]{geometry}
\usepackage{pdfpages}
\begin{document}

\includepdf%
[pages=-,%
nup=2x1,%
% noautoscale,%
% frame,%
signature=4,% multiple of 4
landscape,%
]{build/cheat-sheet.pdf}

\end{document}
%
% This can also be generated on the command line:
%
%   pdfjam         cheat-sheet.pdf \
%     --outfile cheat-sheetlet.pdf \
%     --keepinfo \
%     --letterpaper \
%     --landscape \
%     --nup 2x1 \
%     --signature=20 # this may vary
%
% or use my bash function which does the same thing,
% (and which automatically calculates the signature size)
%
%   booklet book-of-integrals.pdf -o booklet-of-integrals.pdf
%
% function booklet()
% {
%   local source="$1"
%   shift
%   pdfjam \
%     --keepinfo \
%     --letterpaper \
%     --landscape \
%     --nup 2x1 \
%     --signature $(pdfcount "$source" 4) \
%     "$@"\
%     -- "$source"
% }
%
% which requires pdfjam, and also uses:
%
% function pdfcount()
% {
%   local mod='' # round up to a multiple of this
%   local pdf="$1"
%   if test ! -f "$1" ; then echo "file not found: $1"; else
%     if [[ -n $2 ]]; then mod='+('$2'-$2%'$2')%'$2; fi
%     pdftk "$pdf" dump_data | awk '/^NumberOfPages/{print$2'$mod'}'
%   fi
% }
%
% which requires pdftk