Given an input file containing a newID value and oldId value, perform a mass find/replace across a series of files

massFindReplace.sh

#!/bin/bash
# set -x
# CSV FILE MUST HAVE EMPTY LINE AT END AND NO ""

# Given an input file containing a newID value and oldId value, perform a mass find/replace across a series of files
INPUT=inputdata.csv
EXCLUDEDIR=/Users/mv/folder\ to\ exclude
EXCLUDEFILE=fileToExclude.csv
SEARCHDIR=/Users/mv/search\ directory
OLDIFS=$IFS
IFS=','
[ ! -f $INPUT ] && { echo "$INPUT file not found"; exit 99; }
while read newId oldId
do
    #echo "newId: $newId"
    #echo "oldId: $oldId"
    
	grep -RIlZ --exclude-dir="$EXCLUDEDIR" --exclude "$EXCLUDEFILE" "$oldId" "$SEARCHDIR" | while read -r line ; do
        #echo "$line"
        sed -i "" "s/$oldId/$newId/g" """$line"""
    done
done < $INPUT
IFS=$OLDIFS