General file paths for replicating shell scripts on any linux OS - linux

Question

I'm doing a shell script that is intended to be replicated on any user directory. The same script should be able to recognize any user's directories structure. Since I don't know the directory structure of every user, I wasn't able to recognize the parent folder to run some commands inside my script (Find command in the script). I would appreciate so much your help.
As you can see in my code below, I have three different types of paths ~/Desktop/input_folder/source.txt, ~/Desktop/output_folder/FILE_${array[$i]}_${array[$((i+1))]}.txt, and ../shares/path/FOLDER_WITH_MANY_FILES.
The third path has a route that I don't know where is located, so I used ../ to tell the script that assume the parent folder. For the first and second route, I used ~/because the route is in /home/username/. Am I doing it right? Do these routes need double commas ("/path/blah") in order to be read it by shell? I would appreciate your help.
Thanks!
My code:
#!/bin/bash
#source file location
input=$(cat ~/Desktop/input_folder/source.txt )
#read file
IFS=',' read -r -a array <<< "$input"
for((i=0;i<${#array[#]}-1;i+=2));do
#Create the file
touch ~/Desktop/output_folder/FILE_${array[$i]}_${array[$((i+1))]}.txt
echo "Search result for these parameters [${array[$i]},${array[$((i+1))]}]: "$'\r' >> ~/Desktop/output_folder/FILE_${array[$i]}_${array[$((i+1))]}.txt
#Find pattern and save it in file
find ../shares/path/FOLDER_WITH_MANY_FILES -name "*${array[$((i+1))]}*" -exec grep -l "${array[$i]}" {} + | tee -a ~/Desktop/output_folder/FILE_${array[$i]}_${array[$((i+1))]}.txt