A simple file-driven concatenation command

catdeck.sh

#!/bin/bash

catdeck() {
  if [[ "$#" -eq 0 ]]; then
    (>&2 echo "usage: $0 final_file_name.catdeck")
    exit 1
  fi

  OUTPUTFILE=$(echo "$1" | sed 's/\.catdeck//')
  echo -n "" > "$OUTPUTFILE"

  for FILE in `cat "$1"`; do
    2>/dev/null cat "$FILE" >> "$OUTPUTFILE" || echo "$FILE" >> "$OUTPUTFILE"
  done
}

catdeck "$@"