Impose PDF - repeat the same page multiple times

imposepdf-repeat.sh

#!/bin/bash
#
# imposepdf-repeat.sh
#
# Author: Martin Malec <[email protected]>
# Date  : May 17, 2017
#
# Description: imposepdf-repeat.sh repeats one-page PDF multiple times
#              on a single page. Requires bookletimposer installed.
#
# Usage : imposepdf-repeat.sh -r <repetitions> <inputfile.pdf>
#    where <repetitions> is the number of repetitions of the page, valid values
#    are currently  2 (2x1), 4 (2x2), 8 (4x2) or directly the [w]x[h]
#
#    This script is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#####################################################

usage="$(basename "$0") [-h] [-r n] inputfile.pdf -- repeats one-page PDF multiple times on a single page

where:
    -h  show this help text
    -r  sets number of repetitions (2, 4, 8, or directly a matrix for bookletimposer, such as 4x4) (default: 2)"

repetitions=2
while getopts ':hr:' option; do
  case "$option" in
    h) echo "$usage"
       exit
       ;;
    r) repetitions=$OPTARG
       ;;
    :) printf "missing argument for -%s\n" "$OPTARG" >&2
       echo "$usage" >&2
       exit 1
       ;;
   \?) printf "illegal option: -%s\n" "$OPTARG" >&2
       echo "$usage" >&2
       exit 1
       ;;
  esac
done
shift $((OPTIND - 1))

hash bookletimposer 2>/dev/null || { echo >&2 "error: bookletimposer seems not to be installed or available in PATH Exiting, install it first (apt install bookletimposer in Debian/Ubuntu/Mint)."; exit 1; }

re='^[0-9]+$'
if ! [[ $repetitions =~ $re ]] ; then
   echo "warning: Amount of repetitions is not a number, valid numbers are 2, 4 or 8, any other values are sent without check to bookletimposer" >&2
fi

if !  [[ -r "$1" ]]
then
    echo "error: Input file $1 not found">&2
    echo "$usage" >&2
    exit 1
fi

case "$repetitions" in
"2")
  layout="2x1"
  bookletimposer -a -b -c -n -p "$layout" -o "${1%.*}"-"$repetitions"x.pdf "$1"
;;
"4")
  layout="2x2"
  bookletimposer -a -b -c -n -p "$layout" -o "${1%.*}"-"$repetitions"x.pdf "$1"
;;
"8")
  layout="4x2"
  bookletimposer -a -b -c -n -p "$layout" -o "${1%.*}"-"$repetitions"x.pdf "$1"
;;
*)
  layout="$repetitions"
  bookletimposer -a -b -c -n -p "$layout" -o "${1%.*}"-"$repetitions".pdf "$1"
;;
esac