shrink slides or pdfs to nxm sheets per page

convert-to-pdf

#!/bin/bash

# converts to pdf all txt files in a folder
# and produces a single pdf of all of them together

for filename in $(ls *.txt); do
  libreoffice --convert-to "pdf" "$filename" 
done


# join all of them in a single pdf
pdftk $(ls *.pdf) cat output output_all.pdf   

prepend-filename.sh

#!/bin/bash

# prepends the filename to all txt files in a folder:

for filename in $(ls *.txt); do
   sed  -i.bak "1s;^;${filename}\n;" "$filename"
done

shrink-nxm.sh

#!/bin/bash

# converts a set of slides to a 3x2 set of slides
# see https://tex.stackexchange.com/questions/557580/pdfjam-or-equivalent-custom-layout-for-multiple-pages-per-sheet

INPUT="$1"
NUP="$2"

pdfnup --suffix "$NUP" --frame True --nup $NUP $INPUT

# usage ./shrink-nxm file.pdf 2x1
# produces a file-2x1.pdf in the same folder