turning A5 pdf into 2up A4 pdf

a5_to_a4.sh

# using pdfjam to turn smaller files into 2-up, A4.
#
# as seen on: http://superuser.com/questions/366490/how-to-merge-multiple-pdf-files-onto-one-page-with-pdftk
#
# brew install homebrew/tex/pdfjam

# the 2017-2-ta.tex file uses the \foreach construct from \usepackage{tikz} 
# which allows
# \def\mylist{info/something else/a third thing, 
#             info/something else/yet another thing}
#
# \foreach \theClass/\guest/\present/\child in  \mylist { \newpage .... STUFF  }

xelatex 2017-2-ta.tex # makes .pdf file 
pdfjam 2017-2-ta.pdf --nup 2x1 --landscape --outfile ta-2-up.pdf