Adding files sizes using bash command "wc" - bash

Question

I ran this command to find each file modified yesterday:
find /eqtynas/ -type f -mtime -1 > /home/writtenToStorage.20171026 &
and then developed this script to add up all the files collected by the script, and sum the sizes. .
#!/bin/bash
ydate=$(date +%Y%m%d --date="yesterday")
file="/home/writtenToStorage.$ydate"
fileSize=0
for line in $(cat $file)
do
if [ -f $line ] && [ -s $line ] ; then
fileSize1=$fileSize
fileSize=$(wc -c < $line)
Total=$(( $fileSize + $fileSize1 ))
fi
done
echo $Total
However when I stat just one of the files in the list It comes out to 18942, where as the total for all the files combined comes out at 34499.
wc -c /eqty/fixed
18942 /eqty/fixed
Is the script ok - because I ran another check and the total size was 314 gigs
find /eqtynas/ -type f -mtime -1 -print0 | du -ch --files0-from=- --total -s > 24hourUsage.20171026 &

Answer 1

Continuing from my comment, you may prefer something similar to:
sum=
while read -r sz; do
sum=$((sum + sz))
done < <(find /eqtynas/ -type f -mtime -1 -exec stat -c %s '{}' \; )
echo "sum: $sum"
There are a number of ways to do this. You can also pipe the result of -exec ls -al '{}' to awk and just sum the 5th field.
If you have already written the filenames to /home/writtenToStorage.20171026, then you can simply redirect the file to your while loop, e.g.
while read -r sz; do
sum=$((sum + sz))
done <"/home/writtenToStorage.20171026"
Look things over and let me know i you have any questions.

Answer 2

You're not adding to Total, you're just setting it to the sum of the sizes of the last two files.
for line in $(cat $file)
do
if [ -f $line ] && [ -s $line ] ; then
fileSize=$(wc -c < $line)
((Total += fileSize))
fi
done