paper-transform.sh

#!/bin/bash

# Global constants
CLEAR='\033[0m'
RED='\033[0;31m'

# Helper usage function
function usage() {
  if [ -n "$1" ]; then
    echo -e "${RED}ERROR: $1${CLEAR}\n";
  fi
  echo "Usage: $0 [-f files]"
  echo "  -f, --files              The files to transform"
  echo ""
  echo "Optional:"
  echo "  -t, --trim               The trim value. If it is not specified defaults"
  echo "                           to LNCS trim value '3.2cm 3.2cm 3.2cm 3.2cm'"
  echo ""
  echo "Example: $0 --files 'test1.pdf test2.pdf' --trim '1cm 2cm 1cm 2cm'"
  exit 1
}

# Parse parameteres
while [[ "$#" > 0 ]]; do case $1 in
  -f|--files) FILES="$2";shift;shift;;
  -t|--trim) TRIM="$2";shift;shift;;
  *) usage "Unknown parameter passed: $1"; shift;shift;;
esac; done

# Verify parameters
if [ -z "$FILES" ]; then usage "Files are not set"; fi;
if [ -z "$TRIM" ]; then TRIM='3.2cm 3.2cm 3.2cm 3.2cm'; fi;

for file in $FILES; do
  pdfjam "$file" --trim "$TRIM" --clip true --outfile tmp.pdf;
  pdfjam tmp.pdf --batch --nup 2x1 --suffix 2up --landscape --outfile "$file";
  rm -f tmp.pdf
done