Batch replace text in PDF

replacePDFtext.sh

#!/bin/bash                                                                                                                                                                                                                                                                     
#!-----------------------------------                                                                                                                                                                                                                                           
#! Replace "oldtext" with "newtext"                                                                                                                                                                                                                                             
#! inside all pdf files in the directory.                                                                                                                                                                                                                                       
#! The old files are saved as *.pdf.bak                                                                                                                                                                                                                                         
#!                                                                                                                                                                                                                                                                              
#! Needs the pdftk package                                                                                                                                                                                                                                                      
#! http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/                                                                                                                                                                                                                          
#!-------------------------------------                                                                                                                                                                                                                                         
#                                                                                                                                                                                                                                                                               
export LC_CTYPE=C
export LANG=C

oldtext=Preliminary
newtext="Private Work"

indir=${1-"."}

echo "Replacing $oldtext with $newtext in directory $indir"

for pdffile in `find $indir -type f -name "*.pdf"`;
do
   echo "Processing $pdffile..."
   cp $pdffile $pdffile.bak
   pdftk $pdffile output $pdffile.tmp uncompress
   sed -i -e "s/$oldtext/$newtext/g" $pdffile.tmp

   if [ -e $pdffile ]
   then
       rm $pdffile
       pdftk $pdffile.tmp output $pdffile compress
       rm $pdffile.tmp
       rm $pdffile.tmp-e
   fi
done

Based on https://github.com/cmstas/CMS2_ArchiveJul2013/blob/master/NtupleMacros/Tools/replacepdftext.sh

It fails if any PDFs have spaces in their names.

Correction: On OS X, it doesn't work at all, even if PDFs don't have spaces in their names. It doesn't do any text replacement.

Use this specific version on macOS and it won't hang and should work:
https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/pdftk_server-2.02-mac_osx-10.11-setup.pkg