generate_pkg_file_lists_expected.sh

#/bin/bash
CWD="$(realpath .)"
output_file=${1:-./pkg_contents_list_files}
if [ $# -eq 0 ]; then
  set -- /var/packages/user-installed-packages /var/packages/woof-installed-packages
fi
shift
function replace_extension(){
    while read a_record; do
      case
    done
}
rm "$output_file"
for a_file_path in "$@"; do
  a_file_path="$(realpath "$a_file")"
  a_file=$(basename "$a_file_path")
  a_dir="$(dirname "$a_file")"
  cd "$a_dir"
  #We can 't foward Standard error
  old_setting=${-//[^x]/} #https://stackoverflow.com/questions/14564746/in-bash-how-to-get-the-current-status-of-set-x
  case "$a_file" in
  */builtin_files)
    cut -f2,3,8 -d '|' "$a_file" | sed -n 's#$#\|builtin_files\|#g' | sed -r 's#(^.*)(\|[^[|]+)(.deb|.pet)\|#\2.list\1#g' >> output_file
    ;;
  */packages)
    cut -f2,3,8 -d '|' "$a_file" | sed -n 's#$#\|builtin_files\|#g' | sed -r 's#(^.*)(\|[^[|]+)(.deb|.pet)\|#\2.list\1#g' >> output_file
    ;;
  */dpkg)
    cut -f2,3,8 -d '|' "$a_file" | sed -n 's#$#\|builtin_files\|#g' | sed -r 's#(^.*)(\|[^[|]+)(.deb|.pet)\|#\2.list\1#g' >> output_file
    ;;
  esac
  if [[ -n "$old_setting" ]]; then set -x; else set +x; fi
done