qpdf-swap-pages-1-2

#!/usr/bin/bash
O_FILE=$1
if [ "${O_FILE}" == '' ]
then
   notify-send -t 0 --icon=dialog-error 'QPDF - Error With Swap Pages 1 & 2' 'You must specify a valid pdf file.'
   exit 1
fi
inf=${O_FILE}
outf=${O_FILE[@]::-4}-Swapped.pdf
notify-send -t 0 --icon=dialog-information 'QPDF - Swap Pages 1 & 2 - Starting' 'Generating new pdf file...\n'${outf}
qpdf ${inf} --pages ${inf} 2,1,3-z -- ${outf}
if [ $? -ne 0 ]
then
   notify-send -t 0 --icon=dialog-error 'QPDF - Error With Swap Pages 1 & 2' 'QPDF tool failed to generate a new pdf with pages 1 & 2 swapped. Maybe try using the qpdf command line...\n'${outf}
   exit 1
fi
notify-send -t 0 --icon=emblem-default 'QPDF - Swap Pages 1 & 2 - Completed' 'QPDF generated a new pdf file here -\n'${outf}