I spent several hours trying to figure this out. There are so many resources in the internet that it is often difficult to get what we really need. I am writing it down here in case I forget again one day (or if anybody is experiencing the same problem).
Some suggested modifying the .bashrc files, some suggested to modify the etc/profile file, but what worked for me was by modifying the "environment" file. I just searched for the environment file using the search facility of mint linux's finder, then modify it by adding my directory path.
Logged out, logged back in, and I was able to execute all the files within my target directory. Nothing fancy, but it worked out for me.