Merge pupils' solutions to PDF script

#!/bin/bash

# Open all image files in feh before working on them, to rotate them to proper orientation by hand
feh --recursive --edit --scale-down --auto-zoom --geometry 1280x740 "$1"

cd "$1"

# Iterate over folders, each of which contains files from one pupil
for FOLDER in "$1"/*/; do

    # Get the pupil's name
    echo "$FOLDER" >> "$1"/log.log
    cd "$FOLDER"
    NAME=$(basename "$FOLDER" | cut -f1 -d "_")
    echo $NAME >> "$1"/log.log

    # If the pupil submitted PDFs, join them; if the result is larger than 5MB, compress it with ps2pdf
    if [[ $(ls) == *"pdf"* ]]; then

        pdfunite *.pdf "$NAME".pdf

        if [ $(stat --printf="%s" "$NAME".pdf) -gt "5000000" ]; then
            echo "pdf too large, compressing" >> "$1"/log.log
            ps2pdf "$NAME".pdf _compressed_"$NAME".pdf
            mv _compressed_"$NAME".pdf "$NAME".pdf
        fi

        mv "$NAME".pdf ../"$NAME".pdf
    else

    # If the pupil submitted images, iterate over them, remove the orientation EXIF data to preserve the manually set orientation, then compress the individual image files, if they are larger than 1,5MB; then merge the image files to a PDF
        for filename in ./*; do
            exiv2 rm "filename"

                if [ $(stat --printf="%s" "$filename") -gt "1500000" ]; then
                    echo "image $filename too large, compressing" >> "$1"/log.log
                    name=$(basename "$filename" | awk -F'.' 'sub(FS $NF,x)')
                    echo "$name" >> "$1"/log.log
                    magick "$filename" -interlace Plane -gaussian-blur 0.05 -quality 85% _compressed_"$name".jpg
                    rm "$filename"
                fi
        done

        convert * ../"$NAME".pdf

    fi

    # Set the size to A4 such that the pen thickness in Xournal++ is suiting
    gs -sDEVICE=pdfwrite -sPAPERSIZE=a4 -dPDFFitPage -dPDFSETTINGS=/default -dNOPAUSE -dQUIET -dBATCH -sOutputFile=../out.pdf  ../"$NAME".pdf

    # Set the DPI to a low value such that the pixel dimensions are not too large and Xournal++ won't hang
    convert -units PixelsPerInch -density 120 ../out.pdf ../"$NAME".pdf
    rm ../out.pdf
done