How can I run MATLAB from the Terminal in any drive?

Hello, I have a problem with my Mac and MATLAB.

I need to run MATLAB form the Terminal and I nedd to do this from different drive, different from the installation drive of the program (Machintosh HD/Applications/MATLAB_R2018a.app/bin/matlab).

If I try to run Matlab in this drive with the command ./matlab, obviously it works but if I try from any other drive it doesn't. I find something about create an alias with the command

    sudo ln -s /Applications/MATLAB_R2018a.app/bin/matlab matlab

but the result i got is

    ln: matlab: File exists

How can I solve this problem?? Thank you very much for the help!