#!/bin/bash

fs1=$(du -b $1 | cut -f1)
fs2=$(du -b $2 | cut -f1)

echo "File size of $1 is: $fs1 bytes"
echo "File size of $2 is: $fs2 bytes"

total=$((fs1 + $fs2))

echo "Total size is: $total bytes"

# File size of hello.sh is: 32 bytes
# File size of numbers.sh is: 125 bytes
# Total size is: 157 bytes