Manga Time!! Add these files to your path and from any folder execute mangaTime.sh or compressFiles.sh <FOLDER> to transform a folder with a set of images into a zip folder

compressFiles.sh

#!/bin/bash

if [ -z "$1" ]; then
  echo "Help : To compress file use argument with directory"
  exit 0
fi

filename="${1}.cbz"

if [ -e "$filename" ]; then
  echo "WARNING: file exists: $filename" >&2
else
  echo "Compresing $@ into $filename"
  cd "$@"
  zip "$filename" *
  mv "$filename" ..
  cd ..
fi

mangaTime.sh

#!/bin/bash

for file in *
do
  if [[ -d "$file" ]]; then
    compressFiles.sh "$file"
  fi
done

mkdir zips
mv *.cbz zips/